(Slip Opinion) OCTOBER TERM, 2006 1
Syllabus
NOTE: Where it is feasible, a syllabus (headnote) will be released, as is
being done in connection with this case, at the time the opinion is issued.
The syllabus constitutes no part of the opinion of the Court but has been
prepared by the Reporter of Decisions for the convenience of the reader.
See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337.
SUPREME COURT OF THE UNITED STATES
Syllabus
KSR INTERNATIONAL CO. v. TELEFLEX INC. ET AL.
CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR
THE FEDERAL CIRCUIT
No. 04–1350. Argued November 28, 2006—Decided April 30, 2007
To control a conventional automobile’s speed, the driver depresses or
releases the gas pedal, which interacts with the throttle via a cable or
other mechanical link. Because the pedal’s position in the footwell
normally cannot be adjusted, a driver wishing to be closer or farther
from it must either reposition himself in the seat or move the seat,
both of which can be imperfect solutions for smaller drivers in cars
with deep footwells. This prompted inventors to design and patent
pedals that could be adjusted to change their locations. The Asano
patent reveals a support structure whereby, when the pedal location
is adjusted, one of the pedal’s pivot points stays fixed. Asano is also
designed so that the force necessary to depress the pedal is the same
regardless of location adjustments. The Redding patent reveals a dif
ferent, sliding mechanism where both the pedal and the pivot point
are adjusted.
In newer cars, computer-controlled throttles do not operate through
force transferred from the pedal by a mechanical link, but open and
close valves in response to electronic signals. For the computer to
know what is happening with the pedal, an electronic sensor must
translate the mechanical operation into digital data. Inventors had
obtained a number of patents for such sensors. The so-called ’936
patent taught that it was preferable to detect the pedal’s position in
the pedal mechanism, not in the engine, so the patent disclosed a
pedal with an electronic sensor on a pivot point in the pedal assem
bly. The Smith patent taught that to prevent the wires connecting
the sensor to the computer from chafing and wearing out, the sensor
should be put on a fixed part of the pedal assembly rather than in or
on the pedal’s footpad. Inventors had also patented self-contained
modular sensors, which can be taken off the shelf and attached to any
2 KSR INT’L CO. v. TELEFLEX INC.
Syllabus
mechanical pedal to allow it to function with a computer-controlled
throttle. The ’068 patent disclosed one such sensor. Chevrolet also
manufactured trucks using modular sensors attached to the pedal
support bracket, adjacent to the pedal and engaged with the pivot
shaft about which the pedal rotates. Other patents disclose elec
tronic sensors attached to adjustable pedal assemblies. For example,
the Rixon patent locates the sensor in the pedal footpad, but is known
for wire chafing.
After petitioner KSR developed an adjustable pedal system for cars
with cable-actuated throttles and obtained its ’976 patent for the de
sign, General Motors Corporation (GMC) chose KSR to supply ad
justable pedal systems for trucks using computer-controlled throttles.
To make the ’976 pedal compatible with the trucks, KSR added a
modular sensor to its design. Respondents (Teleflex) hold the exclu
sive license for the Engelgau patent, claim 4 of which discloses a posi
tion-adjustable pedal assembly with an electronic pedal position sen
sor attached a fixed pivot point. Despite having denied a similar,
broader claim, the U. S. Patent and Trademark Office (PTO) had al
lowed claim 4 because it included the limitation of a fixed pivot posi
tion, which distinguished the design from Redding’s. Asano was nei
ther included among the Engelgau patent’s prior art references nor
mentioned in the patent’s prosecution, and the PTO did not have be
fore it an adjustable pedal with a fixed pivot point. After learning of
KSR’s design for GMC, Teleflex sued for infringement, asserting that
KSR’s pedal system infringed the Engelgau patent’s claim 4. KSR
countered that claim 4 was invalid under §103 of the Patent Act,
which forbids issuance of a patent when “the differences between the
subject matter sought to be patented and the prior art are such that
the subject matter as a whole would have been obvious at the time
the invention was made to a person having ordinary skill in the art.”
Graham v. John Deere Co. of Kansas City, 383 U. S. 1, 17–18, set
out an objective analysis for applying §103: “[T]he scope and content
of the prior art are . . . determined; differences between the prior art
and the claims at issue are . . . ascertained; and the level of ordinary
skill in the pertinent art resolved. Against this background the obvi
ousness or nonobviousness of the subject matter is determined. Such
secondary considerations as commercial success, long felt but un
solved needs, failure of others, etc., might be utilized to give light to
the circumstances surrounding the origin of the subject matter
sought to be patented.” While the sequence of these questions might
be reordered in any particular case, the factors define the controlling
inquiry. However, seeking to resolve the obviousness question with
more uniformity and consistency, the Federal Circuit has employed a
“teaching, suggestion, or motivation” (TSM) test, under which a pat
Cite as: 550 U. S. ____ (2007) 3
Syllabus
ent claim is only proved obvious if the prior art, the problem’s nature,
or the knowledge of a person having ordinary skill in the art reveals
some motivation or suggestion to combine the prior art teachings.
The District Court granted KSR summary judgment. After review
ing pedal design history, the Engelgau patent’s scope, and the rele
vant prior art, the court considered claim 4’s validity, applying Gra
ham’s framework to determine whether under summary-judgment
standards KSR had demonstrated that claim 4 was obvious. The
court found “little difference” between the prior art’s teachings and
claim 4: Asano taught everything contained in the claim except using
a sensor to detect the pedal’s position and transmit it to a computer
controlling the throttle. That additional aspect was revealed in, e.g.,
the ’068 patent and Chevrolet’s sensors. The court then held that
KSR satisfied the TSM test, reasoning (1) the state of the industry
would lead inevitably to combinations of electronic sensors and ad
justable pedals, (2) Rixon provided the basis for these developments,
and (3) Smith taught a solution to Rixon’s chafing problems by posi
tioning the sensor on the pedal’s fixed structure, which could lead to
the combination of a pedal like Asano with a pedal position sensor.
Reversing, the Federal Circuit ruled the District Court had not
applied the TSM test strictly enough, having failed to make findings
as to the specific understanding or principle within a skilled artisan’s
knowledge that would have motivated one with no knowledge of the
invention to attach an electronic control to the Asano assembly’s sup
port bracket. The Court of Appeals held that the District Court’s re
course to the nature of the problem to be solved was insufficient be
cause, unless the prior art references addressed the precise problem
that the patentee was trying to solve, the problem would not motivate
an inventor to look at those references. The appeals court found that
the Asano pedal was designed to ensure that the force required to de
press the pedal is the same no matter how the pedal is adjusted,
whereas Engelgau sought to provide a simpler, smaller, cheaper ad
justable electronic pedal. The Rixon pedal, said the court, suffered
from chafing but was not designed to solve that problem and taught
nothing helpful to Engelgau’s purpose. Smith, in turn, did not relate
to adjustable pedals and did not necessarily go to the issue of motiva
tion to attach the electronic control on the pedal assembly’s support
bracket. So interpreted, the court held, the patents would not have
led a person of ordinary skill to put a sensor on an Asano-like pedal.
That it might have been obvious to try that combination was likewise
irrelevant. Finally, the court held that genuine issues of material
fact precluded summary judgment.
Held: The Federal Circuit addressed the obviousness question in a nar
row, rigid manner that is inconsistent with §103 and this Court’s
4 KSR INT’L CO. v. TELEFLEX INC.
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precedents. KSR provided convincing evidence that mounting an
available sensor on a fixed pivot point of the Asano pedal was a de
sign step well within the grasp of a person of ordinary skill in the
relevant art and that the benefit of doing so would be obvious. Its ar
guments, and the record, demonstrate that the Engelgau patent’s
claim 4 is obvious. Pp. 11–24.
1. Graham provided an expansive and flexible approach to the ob
viousness question that is inconsistent with the way the Federal Cir
cuit applied its TSM test here. Neither §103’s enactment nor Gra
ham’s analysis disturbed the Court’s earlier instructions concerning
the need for caution in granting a patent based on the combination of
elements found in the prior art. See Great Atlantic & Pacific Tea Co.
v. Supermarket Equipment Corp., 340 U. S. 147, 152. Such a combi
nation of familiar elements according to known methods is likely to
be obvious when it does no more than yield predictable results. See,
e.g., United States v. Adams, 383 U. S. 39, 50–52. When a work is
available in one field, design incentives and other market forces can
prompt variations of it, either in the same field or in another. If a
person of ordinary skill in the art can implement a predictable varia
tion, and would see the benefit of doing so, §103 likely bars its pat
entability. Moreover, if a technique has been used to improve one
device, and a person of ordinary skill in the art would recognize that
it would improve similar devices in the same way, using the tech
nique is obvious unless its actual application is beyond that person’s
skill. A court must ask whether the improvement is more than the
predictable use of prior-art elements according to their established
functions. Following these principles may be difficult if the claimed
subject matter involves more than the simple substitution of one
known element for another or the mere application of a known tech
nique to a piece of prior art ready for the improvement. To determine
whether there was an apparent reason to combine the known ele
ments in the way a patent claims, it will often be necessary to look to
interrelated teachings of multiple patents; to the effects of demands
known to the design community or present in the marketplace; and to
the background knowledge possessed by a person having ordinary
skill in the art. To facilitate review, this analysis should be made ex
plicit. But it need not seek out precise teachings directed to the chal
lenged claim’s specific subject matter, for a court can consider the in
ferences and creative steps a person of ordinary skill in the art would
employ. Pp. 11–14.
(b) The TSM test captures a helpful insight: A patent composed of
several elements is not proved obvious merely by demonstrating that
each element was, independently, known in the prior art. Although
common sense directs caution as to a patent application claiming as
Cite as: 550 U. S. ____ (2007) 5
Syllabus
innovation the combination of two known devices according to their
established functions, it can be important to identify a reason that
would have prompted a person of ordinary skill in the art to combine
the elements as the new invention does. Inventions usually rely
upon building blocks long since uncovered, and claimed discoveries
almost necessarily will be combinations of what, in some sense, is al
ready known. Helpful insights, however, need not become rigid and
mandatory formulas. If it is so applied, the TSM test is incompatible
with this Court’s precedents. The diversity of inventive pursuits and
of modern technology counsels against confining the obviousness
analysis by a formalistic conception of the words teaching, sugges
tion, and motivation, or by overemphasizing the importance of pub
lished articles and the explicit content of issued patents. In many
fields there may be little discussion of obvious techniques or combina
tions, and market demand, rather than scientific literature, may of
ten drive design trends. Granting patent protection to advances that
would occur in the ordinary course without real innovation retards
progress and may, for patents combining previously known elements,
deprive prior inventions of their value or utility. Since the TSM test
was devised, the Federal Circuit doubtless has applied it in accord
with these principles in many cases. There is no necessary inconsis
tency between the test and the Graham analysis. But a court errs
where, as here, it transforms general principle into a rigid rule limit
ing the obviousness inquiry. Pp. 14–15.
(c) The flaws in the Federal Circuit’s analysis relate mostly to its
narrow conception of the obviousness inquiry consequent in its appli
cation of the TSM test. The Circuit first erred in holding that courts
and patent examiners should look only to the problem the patentee
was trying to solve. Under the correct analysis, any need or problem
known in the field and addressed by the patent can provide a reason
for combining the elements in the manner claimed. Second, the ap
peals court erred in assuming that a person of ordinary skill in the
art attempting to solve a problem will be led only to those prior art
elements designed to solve the same problem. The court wrongly
concluded that because Asano’s primary purpose was solving the con
stant ratio problem, an inventor considering how to put a sensor on
an adjustable pedal would have no reason to consider putting it on
the Asano pedal. It is common sense that familiar items may have
obvious uses beyond their primary purposes, and a person of ordinary
skill often will be able to fit the teachings of multiple patents to
gether like pieces of a puzzle. Regardless of Asano’s primary pur
pose, it provided an obvious example of an adjustable pedal with a
fixed pivot point, and the prior art was replete with patents indicat
ing that such a point was an ideal mount for a sensor. Third, the
6 KSR INT’L CO. v. TELEFLEX INC.
Syllabus
court erred in concluding that a patent claim cannot be proved obvi
ous merely by showing that the combination of elements was obvious
to try. When there is a design need or market pressure to solve a
problem and there are a finite number of identified, predictable solu
tions, a person of ordinary skill in the art has good reason to pursue
the known options within his or her technical grasp. If this leads to
the anticipated success, it is likely the product not of innovation but
of ordinary skill and common sense. Finally, the court drew the
wrong conclusion from the risk of courts and patent examiners falling
prey to hindsight bias. Rigid preventative rules that deny recourse to
common sense are neither necessary under, nor consistent with, this
Court’s case law. Pp. 15–18.
2. Application of the foregoing standards demonstrates that claim 4
is obvious. Pp. 18–23.
(a) The Court rejects Teleflex’s argument that the Asano pivot
mechanism’s design prevents its combination with a sensor in the
manner claim 4 describes. This argument was not raised before the
District Court, and it is unclear whether it was raised before the
Federal Circuit. Given the significance of the District Court’s finding
that combining Asano with a pivot-mounted pedal position sensor fell
within claim 4’s scope, it is apparent that Teleflex would have made
clearer challenges if it intended to preserve this claim. Its failure to
clearly raise the argument, and the appeals court’s silence on the is
sue, lead this Court to accept the District Court’s conclusion. Pp. 18–
20.
(b) The District Court correctly concluded that when Engelgau
designed the claim 4 subject matter, it was obvious to a person of or
dinary skill in the art to combine Asano with a pivot-mounted pedal
position sensor. There then was a marketplace creating a strong in
centive to convert mechanical pedals to electronic pedals, and the
prior art taught a number of methods for doing so. The Federal Cir
cuit considered the issue too narrowly by, in effect, asking whether a
pedal designer writing on a blank slate would have chosen both
Asano and a modular sensor similar to the ones used in the Chevrolet
trucks and disclosed in the ’068 patent. The proper question was
whether a pedal designer of ordinary skill in the art, facing the wide
range of needs created by developments in the field, would have seen
an obvious benefit to upgrading Asano with a sensor. For such a de
signer starting with Asano, the question was where to attach the
sensor. The ’936 patent taught the utility of putting the sensor on
the pedal device. Smith, in turn, explained not to put the sensor on
the pedal footpad, but instead on the structure. And from Rixon’s
known wire-chafing problems, and Smith’s teaching that the pedal
assemblies must not precipitate any motion in the connecting wires,
Cite as: 550 U. S. ____ (2007) 7
Syllabus
the designer would know to place the sensor on a nonmoving part of
the pedal structure. The most obvious such point is a pivot point.
The designer, accordingly, would follow Smith in mounting the sensor
there. Just as it was possible to begin with the objective to upgrade
Asano to work with a computer-controlled throttle, so too was it pos
sible to take an adjustable electronic pedal like Rixon and seek an
improvement that would avoid the wire-chafing problem. Teleflex
has not shown anything in the prior art that taught away from the
use of Asano, nor any secondary factors to dislodge the determination
that claim 4 is obvious. Pp. 20–23.
3. The Court disagrees with the Federal Circuit’s holding that
genuine issues of material fact precluded summary judgment. The
ultimate judgment of obviousness is a legal determination. Graham,
383 U. S., at 17. Where, as here, the prior art’s content, the patent
claim’s scope, and the level of ordinary skill in the art are not in ma
terial dispute and the claim’s obviousness is apparent, summary
judgment is appropriate. P. 23.
119 Fed. Appx. 282, reversed and remanded.
KENNEDY, J., delivered the opinion for a unanimous Court.
Cite as: 550 U. S. ____ (2007) 1
Opinion of the Court
NOTICE: This opinion is subject to formal revision before publication in the
preliminary print of the United States Reports. Readers are requested to
notify the Reporter of Decisions, Supreme Court of the United States, Wash
ington, D. C. 20543, of any typographical or other formal errors, in order
that corrections may be made before the preliminary print goes to press.
SUPREME COURT OF THE UNITED STATES
_________________
No. 04–1350
_________________
KSR INTERNATIONAL CO., PETITIONER v.
TELEFLEX INC. ET AL.
ON WRIT OF CERTIORARI TO THE UNITED STATES COURT OF
APPEALS FOR THE FEDERAL CIRCUIT
[April 30, 2007]
JUSTICE KENNEDY delivered the opinion of the Court.
Teleflex Incorporated and its subsidiary Technology
Holding Company—both referred to here as Teleflex—
sued KSR International Company for patent infringement.
The patent at issue, United States Patent No. 6,237,565
B1, is entitled “Adjustable Pedal Assembly With Elec
tronic Throttle Control.” Supplemental App. 1. The pat
entee is Steven J. Engelgau, and the patent is referred to
as “the Engelgau patent.” Teleflex holds the exclusive
license to the patent.
Claim 4 of the Engelgau patent describes a mechanism
for combining an electronic sensor with an adjustable
automobile pedal so the pedal’s position can be transmit
ted to a computer that controls the throttle in the vehicle’s
engine. When Teleflex accused KSR of infringing the
Engelgau patent by adding an electronic sensor to one of
KSR’s previously designed pedals, KSR countered that
claim 4 was invalid under the Patent Act, 35 U. S. C. §103,
because its subject matter was obvious.
Section 103 forbids issuance of a patent when “the
differences between the subject matter sought to be pat
2 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
ented and the prior art are such that the subject matter as
a whole would have been obvious at the time the invention
was made to a person having ordinary skill in the art to
which said subject matter pertains.”
In Graham v. John Deere Co. of Kansas City, 383 U. S. 1
(1966), the Court set out a framework for applying the
statutory language of §103, language itself based on the
logic of the earlier decision in Hotchkiss v. Greenwood, 11
How. 248 (1851), and its progeny. See 383 U. S., at 15–17.
The analysis is objective:
“Under §103, the scope and content of the prior art are
to be determined; differences between the prior art
and the claims at issue are to be ascertained; and the
level of ordinary skill in the pertinent art resolved.
Against this background the obviousness or nonobvi
ousness of the subject matter is determined. Such
secondary considerations as commercial success, long
felt but unsolved needs, failure of others, etc., might
be utilized to give light to the circumstances sur
rounding the origin of the subject matter sought to be
patented.” Id., at 17–18.
While the sequence of these questions might be reordered
in any particular case, the factors continue to define the
inquiry that controls. If a court, or patent examiner,
conducts this analysis and concludes the claimed subject
matter was obvious, the claim is invalid under §103.
Seeking to resolve the question of obviousness with
more uniformity and consistency, the Court of Appeals for
the Federal Circuit has employed an approach referred to
by the parties as the “teaching, suggestion, or motivation”
test (TSM test), under which a patent claim is only proved
obvious if “some motivation or suggestion to combine the
prior art teachings” can be found in the prior art, the
nature of the problem, or the knowledge of a person hav
ing ordinary skill in the art. See, e.g., Al-Site Corp. v. VSI
Cite as: 550 U. S. ____ (2007) 3
Opinion of the Court
Int’l, Inc., 174 F. 3d 1308, 1323–1324 (CA Fed. 1999).
KSR challenges that test, or at least its application in this
case. See 119 Fed. Appx. 282, 286–290 (CA Fed. 2005).
Because the Court of Appeals addressed the question of
obviousness in a manner contrary to §103 and our prece
dents, we granted certiorari, 547 U. S ___ (2006). We now
reverse.
I
A
In car engines without computer-controlled throttles,
the accelerator pedal interacts with the throttle via cable
or other mechanical link. The pedal arm acts as a lever
rotating around a pivot point. In a cable-actuated throttle
control the rotation caused by pushing down the pedal
pulls a cable, which in turn pulls open valves in the carbu
retor or fuel injection unit. The wider the valves open, the
more fuel and air are released, causing combustion to
increase and the car to accelerate. When the driver takes
his foot off the pedal, the opposite occurs as the cable is
released and the valves slide closed.
In the 1990’s it became more common to install com
puters in cars to control engine operation. Computer-
controlled throttles open and close valves in response to
electronic signals, not through force transferred from the
pedal by a mechanical link. Constant, delicate adjust
ments of air and fuel mixture are possible. The computer’s
rapid processing of factors beyond the pedal’s position
improves fuel efficiency and engine performance.
For a computer-controlled throttle to respond to a
driver’s operation of the car, the computer must know
what is happening with the pedal. A cable or mechanical
link does not suffice for this purpose; at some point, an
electronic sensor is necessary to translate the mechanical
operation into digital data the computer can understand.
Before discussing sensors further we turn to the me
4 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
chanical design of the pedal itself. In the traditional
design a pedal can be pushed down or released but cannot
have its position in the footwell adjusted by sliding the
pedal forward or back. As a result, a driver who wishes to
be closer or farther from the pedal must either reposition
himself in the driver’s seat or move the seat in some way.
In cars with deep footwells these are imperfect solutions
for drivers of smaller stature. To solve the problem, in
ventors, beginning in the 1970’s, designed pedals that
could be adjusted to change their location in the footwell.
Important for this case are two adjustable pedals disclosed
in U. S. Patent Nos. 5,010,782 (filed July 28, 1989) (Asano)
and 5,460,061 (filed Sept. 17, 1993) (Redding). The Asano
patent reveals a support structure that houses the pedal
so that even when the pedal location is adjusted relative to
the driver, one of the pedal’s pivot points stays fixed. The
pedal is also designed so that the force necessary to push
the pedal down is the same regardless of adjustments to
its location. The Redding patent reveals a different, slid
ing mechanism where both the pedal and the pivot point
are adjusted.
We return to sensors. Well before Engelgau applied for
his challenged patent, some inventors had obtained pat
ents involving electronic pedal sensors for computer-
controlled throttles. These inventions, such as the device
disclosed in U. S. Patent No. 5,241,936 (filed Sept. 9, 1991)
(’936), taught that it was preferable to detect the pedal’s
position in the pedal assembly, not in the engine. The ’936
patent disclosed a pedal with an electronic sensor on a
pivot point in the pedal assembly. U. S. Patent No.
5,063,811 (filed July 9, 1990) (Smith) taught that to pre
vent the wires connecting the sensor to the computer from
chafing and wearing out, and to avoid grime and damage
from the driver’s foot, the sensor should be put on a fixed
part of the pedal assembly rather than in or on the pedal’s
footpad.
Cite as: 550 U. S. ____ (2007) 5
Opinion of the Court
In addition to patents for pedals with integrated sensors
inventors obtained patents for self-contained modular
sensors. A modular sensor is designed independently of a
given pedal so that it can be taken off the shelf and at
tached to mechanical pedals of various sorts, enabling the
pedals to be used in automobiles with computer-controlled
throttles. One such sensor was disclosed in U. S. Patent
No. 5,385,068 (filed Dec. 18, 1992) (’068). In 1994, Chevro
let manufactured a line of trucks using modular sensors
“attached to the pedal support bracket, adjacent to the
pedal and engaged with the pivot shaft about which the
pedal rotates in operation.” 298 F. Supp. 2d 581, 589 (ED
Mich. 2003).
The prior art contained patents involving the placement
of sensors on adjustable pedals as well. For example, U. S.
Patent No. 5,819,593 (filed Aug. 17, 1995) (Rixon) dis
closes an adjustable pedal assembly with an electronic
sensor for detecting the pedal’s position. In the Rixon
pedal the sensor is located in the pedal footpad. The Rixon
pedal was known to suffer from wire chafing when the
pedal was depressed and released.
This short account of pedal and sensor technology leads
to the instant case.
B
KSR, a Canadian company, manufactures and supplies
auto parts, including pedal systems. Ford Motor Company
hired KSR in 1998 to supply an adjustable pedal system
for various lines of automobiles with cable-actuated throt
tle controls. KSR developed an adjustable mechanical
pedal for Ford and obtained U. S. Patent No. 6,151,976
(filed July 16, 1999) (’976) for the design. In 2000, KSR
was chosen by General Motors Corporation (GMC or GM)
to supply adjustable pedal systems for Chevrolet and GMC
light trucks that used engines with computer-controlled
throttles. To make the ’976 pedal compatible with the
6 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
trucks, KSR merely took that design and added a modular
sensor.
Teleflex is a rival to KSR in the design and manufacture
of adjustable pedals. As noted, it is the exclusive licensee
of the Engelgau patent. Engelgau filed the patent applica
tion on August 22, 2000 as a continuation of a previous
application for U. S. Patent No. 6,109,241, which was filed
on January 26, 1999. He has sworn he invented the pat
ent’s subject matter on February 14, 1998. The Engelgau
patent discloses an adjustable electronic pedal described
in the specification as a “simplified vehicle control pedal
assembly that is less expensive, and which uses fewer
parts and is easier to package within the vehicle.” Engel
gau, col. 2, lines 2–5, Supplemental App. 6. Claim 4 of the
patent, at issue here, describes:
“A vehicle control pedal apparatus comprising:
a support adapted to be mounted to a vehicle struc
ture;
an adjustable pedal assembly having a pedal arm
moveable in for[e] and aft directions with respect to
said support;
a pivot for pivotally supporting said adjustable pedal
assembly with respect to said support and defining a
pivot axis; and
an electronic control attached to said support for con
trolling a vehicle system;
said apparatus characterized by said electronic control
being responsive to said pivot for providing a signal
that corresponds to pedal arm position as said pedal
arm pivots about said pivot axis between rest and ap
plied positions wherein the position of said pivot re
mains constant while said pedal arm moves in fore
and aft directions with respect to said pivot.” Id., col.
Cite as: 550 U. S. ____ (2007) 7
Opinion of the Court
6, lines 17–36, Supplemental App. 8 (diagram num
bers omitted).
We agree with the District Court that the claim discloses
“a position-adjustable pedal assembly with an electronic
pedal position sensor attached to the support member of
the pedal assembly. Attaching the sensor to the support
member allows the sensor to remain in a fixed position
while the driver adjusts the pedal.” 298 F. Supp. 2d, at
586–587.
Before issuing the Engelgau patent the U. S. Patent and
Trademark Office (PTO) rejected one of the patent claims
that was similar to, but broader than, the present claim 4.
The claim did not include the requirement that the sensor
be placed on a fixed pivot point. The PTO concluded the
claim was an obvious combination of the prior art dis
closed in Redding and Smith, explaining:
“ ‘Since the prior ar[t] references are from the field of
endeavor, the purpose disclosed . . . would have been
recognized in the pertinent art of Redding. Therefore
it would have been obvious . . . to provide the device of
Redding with the . . . means attached to a support
member as taught by Smith.’ ” Id., at 595.
In other words Redding provided an example of an adjust
able pedal and Smith explained how to mount a sensor on
a pedal’s support structure, and the rejected patent claim
merely put these two teachings together.
Although the broader claim was rejected, claim 4 was
later allowed because it included the limitation of a fixed
pivot point, which distinguished the design from Red
ding’s. Ibid. Engelgau had not included Asano among the
prior art references, and Asano was not mentioned in the
patent’s prosecution. Thus, the PTO did not have before it
an adjustable pedal with a fixed pivot point. The patent
issued on May 29, 2001 and was assigned to Teleflex.
Upon learning of KSR’s design for GM, Teleflex sent a
8 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
warning letter informing KSR that its proposal would
violate the Engelgau patent. “ ‘Teleflex believes that any
supplier of a product that combines an adjustable pedal
with an electronic throttle control necessarily employs
technology covered by one or more’ ” of Teleflex’s patents.
Id., at 585. KSR refused to enter a royalty arrangement
with Teleflex; so Teleflex sued for infringement, asserting
KSR’s pedal infringed the Engelgau patent and two other
patents. Ibid. Teleflex later abandoned its claims regard
ing the other patents and dedicated the patents to the
public. The remaining contention was that KSR’s pedal
system for GM infringed claim 4 of the Engelgau patent.
Teleflex has not argued that the other three claims of the
patent are infringed by KSR’s pedal, nor has Teleflex
argued that the mechanical adjustable pedal designed by
KSR for Ford infringed any of its patents.
C
The District Court granted summary judgment in KSR’s
favor. After reviewing the pertinent history of pedal
design, the scope of the Engelgau patent, and the relevant
prior art, the court considered the validity of the contested
claim. By direction of 35 U. S. C. §282, an issued patent is
presumed valid. The District Court applied Graham’s
framework to determine whether under summary-
judgment standards KSR had overcome the presumption
and demonstrated that claim 4 was obvious in light of the
prior art in existence when the claimed subject matter was
invented. See §102(a).
The District Court determined, in light of the expert
testimony and the parties’ stipulations, that the level of
ordinary skill in pedal design was “ ‘an undergraduate
degree in mechanical engineering (or an equivalent
amount of industry experience) [and] familiarity with
pedal control systems for vehicles.’ ” 298 F. Supp. 2d, at
590. The court then set forth the relevant prior art, in
Cite as: 550 U. S. ____ (2007) 9
Opinion of the Court
cluding the patents and pedal designs described above.
Following Graham’s direction, the court compared the
teachings of the prior art to the claims of Engelgau. It
found “little difference.” 298 F. Supp. 2d, at 590. Asano
taught everything contained in claim 4 except the use of a
sensor to detect the pedal’s position and transmit it to the
computer controlling the throttle. That additional aspect
was revealed in sources such as the ’068 patent and the
sensors used by Chevrolet.
Under the controlling cases from the Court of Appeals
for the Federal Circuit, however, the District Court was
not permitted to stop there. The court was required also
to apply the TSM test. The District Court held KSR had
satisfied the test. It reasoned (1) the state of the industry
would lead inevitably to combinations of electronic sensors
and adjustable pedals, (2) Rixon provided the basis for
these developments, and (3) Smith taught a solution to the
wire chafing problems in Rixon, namely locating the sen
sor on the fixed structure of the pedal. This could lead to
the combination of Asano, or a pedal like it, with a pedal
position sensor.
The conclusion that the Engelgau design was obvious
was supported, in the District Court’s view, by the PTO’s
rejection of the broader version of claim 4. Had Engelgau
included Asano in his patent application, it reasoned, the
PTO would have found claim 4 to be an obvious combina
tion of Asano and Smith, as it had found the broader
version an obvious combination of Redding and Smith. As
a final matter, the District Court held that the secondary
factor of Teleflex’s commercial success with pedals based
on Engelgau’s design did not alter its conclusion. The
District Court granted summary judgment for KSR.
With principal reliance on the TSM test, the Court of
Appeals reversed. It ruled the District Court had not been
strict enough in applying the test, having failed to make
“ ‘finding[s] as to the specific understanding or principle
10 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
within the knowledge of a skilled artisan that would have
motivated one with no knowledge of [the] invention’ . . . to
attach an electronic control to the support bracket of the
Asano assembly.” 119 Fed. Appx., at 288 (brackets in
original) (quoting In re Kotzab, 217 F. 3d 1365, 1371 (CA
Fed. 2000)). The Court of Appeals held that the District
Court was incorrect that the nature of the problem to be
solved satisfied this requirement because unless the “prior
art references address[ed] the precise problem that the
patentee was trying to solve,” the problem would not
motivate an inventor to look at those references. 119 Fed.
Appx., at 288.
Here, the Court of Appeals found, the Asano pedal was
designed to solve the “ ‘constant ratio problem’ ”—that is,
to ensure that the force required to depress the pedal is
the same no matter how the pedal is adjusted—whereas
Engelgau sought to provide a simpler, smaller, cheaper
adjustable electronic pedal. Ibid. As for Rixon, the court
explained, that pedal suffered from the problem of wire
chafing but was not designed to solve it. In the court’s
view Rixon did not teach anything helpful to Engelgau’s
purpose. Smith, in turn, did not relate to adjustable ped
als and did not “necessarily go to the issue of motivation to
attach the electronic control on the support bracket of the
pedal assembly.” Ibid. When the patents were inter
preted in this way, the Court of Appeals held, they would
not have led a person of ordinary skill to put a sensor on
the sort of pedal described in Asano.
That it might have been obvious to try the combination
of Asano and a sensor was likewise irrelevant, in the
court’s view, because “ ‘ “[o]bvious to try” has long been
held not to constitute obviousness.’ ” Id., at 289 (quoting
In re Deuel, 51 F. 3d 1552, 1559 (CA Fed. 1995)).
The Court of Appeals also faulted the District Court’s
consideration of the PTO’s rejection of the broader version
of claim 4. The District Court’s role, the Court of Appeals
Cite as: 550 U. S. ____ (2007) 11
Opinion of the Court
explained, was not to speculate regarding what the PTO
might have done had the Engelgau patent mentioned
Asano. Rather, the court held, the District Court was
obliged first to presume that the issued patent was valid
and then to render its own independent judgment of obvi
ousness based on a review of the prior art. The fact that
the PTO had rejected the broader version of claim 4, the
Court of Appeals said, had no place in that analysis.
The Court of Appeals further held that genuine issues of
material fact precluded summary judgment. Teleflex had
proffered statements from one expert that claim 4 “ ‘was a
simple, elegant, and novel combination of features,’ ” 119
Fed. Appx., at 290, compared to Rixon, and from another
expert that claim 4 was nonobvious because, unlike in
Rixon, the sensor was mounted on the support bracket
rather than the pedal itself. This evidence, the court
concluded, sufficed to require a trial.
II
A
We begin by rejecting the rigid approach of the Court of
Appeals. Throughout this Court’s engagement with the
question of obviousness, our cases have set forth an ex
pansive and flexible approach inconsistent with the way
the Court of Appeals applied its TSM test here. To be
sure, Graham recognized the need for “uniformity and
definiteness.” 383 U. S., at 18. Yet the principles laid
down in Graham reaffirmed the “functional approach” of
Hotchkiss, 11 How. 248. See 383 U. S., at 12. To this end,
Graham set forth a broad inquiry and invited courts,
where appropriate, to look at any secondary considera
tions that would prove instructive. Id., at 17.
Neither the enactment of §103 nor the analysis in Gra
ham disturbed this Court’s earlier instructions concerning
the need for caution in granting a patent based on the
combination of elements found in the prior art. For over a
12 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
half century, the Court has held that a “patent for a com
bination which only unites old elements with no change in
their respective functions . . . obviously withdraws what is
already known into the field of its monopoly and dimin
ishes the resources available to skillful men.” Great At
lantic & Pacific Tea Co. v. Supermarket Equipment Corp.,
340 U. S. 147, 152 (1950). This is a principal reason for
declining to allow patents for what is obvious. The combi
nation of familiar elements according to known methods is
likely to be obvious when it does no more than yield pre
dictable results. Three cases decided after Graham illus
trate the application of this doctrine.
In United States v. Adams, 383 U. S. 39, 40 (1966), a
companion case to Graham, the Court considered the
obviousness of a “wet battery” that varied from prior
designs in two ways: It contained water, rather than the
acids conventionally employed in storage batteries; and its
electrodes were magnesium and cuprous chloride, rather
than zinc and silver chloride. The Court recognized that
when a patent claims a structure already known in the
prior art that is altered by the mere substitution of one
element for another known in the field, the combination
must do more than yield a predictable result. 383 U. S., at
50–51. It nevertheless rejected the Government’s claim
that Adams’s battery was obvious. The Court relied upon
the corollary principle that when the prior art teaches
away from combining certain known elements, discovery
of a successful means of combining them is more likely to
be nonobvious. Id., at 51–52. When Adams designed his
battery, the prior art warned that risks were involved in
using the types of electrodes he employed. The fact that
the elements worked together in an unexpected and fruit
ful manner supported the conclusion that Adams’s design
was not obvious to those skilled in the art.
In Anderson’s-Black Rock, Inc. v. Pavement Salvage Co.,
396 U. S. 57 (1969), the Court elaborated on this approach.
Cite as: 550 U. S. ____ (2007) 13
Opinion of the Court
The subject matter of the patent before the Court was a
device combining two pre-existing elements: a radiant-
heat burner and a paving machine. The device, the Court
concluded, did not create some new synergy: The radiant-
heat burner functioned just as a burner was expected to
function; and the paving machine did the same. The two
in combination did no more than they would in separate,
sequential operation. Id., at 60–62. In those circum
stances, “while the combination of old elements performed
a useful function, it added nothing to the nature and
quality of the radiant-heat burner already patented,” and
the patent failed under §103. Id., at 62 (footnote omitted).
Finally, in Sakraida v. AG Pro, Inc., 425 U. S. 273
(1976), the Court derived from the precedents the conclu
sion that when a patent “simply arranges old elements
with each performing the same function it had been
known to perform” and yields no more than one would
expect from such an arrangement, the combination is
obvious. Id., at 282.
The principles underlying these cases are instructive
when the question is whether a patent claiming the com
bination of elements of prior art is obvious. When a work
is available in one field of endeavor, design incentives and
other market forces can prompt variations of it, either in
the same field or a different one. If a person of ordinary
skill can implement a predictable variation, §103 likely
bars its patentability. For the same reason, if a technique
has been used to improve one device, and a person of
ordinary skill in the art would recognize that it would
improve similar devices in the same way, using the tech
nique is obvious unless its actual application is beyond his
or her skill. Sakraida and Anderson’s-Black Rock are
illustrative—a court must ask whether the improvement
is more than the predictable use of prior art elements
according to their established functions.
Following these principles may be more difficult in other
14 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
cases than it is here because the claimed subject matter
may involve more than the simple substitution of one
known element for another or the mere application of a
known technique to a piece of prior art ready for the im
provement. Often, it will be necessary for a court to look
to interrelated teachings of multiple patents; the effects of
demands known to the design community or present in the
marketplace; and the background knowledge possessed by
a person having ordinary skill in the art, all in order to
determine whether there was an apparent reason to com
bine the known elements in the fashion claimed by the
patent at issue. To facilitate review, this analysis should
be made explicit. See In re Kahn, 441 F. 3d 977, 988 (CA
Fed. 2006) (“[R]ejections on obviousness grounds cannot be
sustained by mere conclusory statements; instead, there
must be some articulated reasoning with some rational
underpinning to support the legal conclusion of obvious
ness”). As our precedents make clear, however, the analy
sis need not seek out precise teachings directed to the
specific subject matter of the challenged claim, for a court
can take account of the inferences and creative steps that
a person of ordinary skill in the art would employ.
B
When it first established the requirement of demon
strating a teaching, suggestion, or motivation to combine
known elements in order to show that the combination is
obvious, the Court of Customs and Patent Appeals cap
tured a helpful insight. See Application of Bergel, 292
F. 2d 955, 956–957 (1961). As is clear from cases such as
Adams, a patent composed of several elements is not
proved obvious merely by demonstrating that each of its
elements was, independently, known in the prior art.
Although common sense directs one to look with care at a
patent application that claims as innovation the combina
tion of two known devices according to their established
Cite as: 550 U. S. ____ (2007) 15
Opinion of the Court
functions, it can be important to identify a reason that
would have prompted a person of ordinary skill in the
relevant field to combine the elements in the way the
claimed new invention does. This is so because inventions
in most, if not all, instances rely upon building blocks long
since uncovered, and claimed discoveries almost of neces
sity will be combinations of what, in some sense, is already
known.
Helpful insights, however, need not become rigid and
mandatory formulas; and when it is so applied, the TSM
test is incompatible with our precedents. The obviousness
analysis cannot be confined by a formalistic conception of
the words teaching, suggestion, and motivation, or by
overemphasis on the importance of published articles and
the explicit content of issued patents. The diversity of
inventive pursuits and of modern technology counsels
against limiting the analysis in this way. In many fields it
may be that there is little discussion of obvious techniques
or combinations, and it often may be the case that market
demand, rather than scientific literature, will drive design
trends. Granting patent protection to advances that
would occur in the ordinary course without real innovation
retards progress and may, in the case of patents combin
ing previously known elements, deprive prior inventions of
their value or utility.
In the years since the Court of Customs and Patent
Appeals set forth the essence of the TSM test, the Court of
Appeals no doubt has applied the test in accord with these
principles in many cases. There is no necessary inconsis
tency between the idea underlying the TSM test and the
Graham analysis. But when a court transforms the gen
eral principle into a rigid rule that limits the obviousness
inquiry, as the Court of Appeals did here, it errs.
C
The flaws in the analysis of the Court of Appeals relate
16 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
for the most part to the court’s narrow conception of the
obviousness inquiry reflected in its application of the TSM
test. In determining whether the subject matter of a
patent claim is obvious, neither the particular motivation
nor the avowed purpose of the patentee controls. What
matters is the objective reach of the claim. If the claim
extends to what is obvious, it is invalid under §103. One
of the ways in which a patent’s subject matter can be
proved obvious is by noting that there existed at the time
of invention a known problem for which there was an
obvious solution encompassed by the patent’s claims.
The first error of the Court of Appeals in this case was
to foreclose this reasoning by holding that courts and
patent examiners should look only to the problem the
patentee was trying to solve. 119 Fed. Appx., at 288. The
Court of Appeals failed to recognize that the problem
motivating the patentee may be only one of many ad
dressed by the patent’s subject matter. The question is
not whether the combination was obvious to the patentee
but whether the combination was obvious to a person with
ordinary skill in the art. Under the correct analysis, any
need or problem known in the field of endeavor at the time
of invention and addressed by the patent can provide a
reason for combining the elements in the manner claimed.
The second error of the Court of Appeals lay in its as
sumption that a person of ordinary skill attempting to
solve a problem will be led only to those elements of prior
art designed to solve the same problem. Ibid. The pri
mary purpose of Asano was solving the constant ratio
problem; so, the court concluded, an inventor considering
how to put a sensor on an adjustable pedal would have no
reason to consider putting it on the Asano pedal. Ibid.
Common sense teaches, however, that familiar items may
have obvious uses beyond their primary purposes, and in
many cases a person of ordinary skill will be able to fit the
teachings of multiple patents together like pieces of a
Cite as: 550 U. S. ____ (2007) 17
Opinion of the Court
puzzle. Regardless of Asano’s primary purpose, the design
provided an obvious example of an adjustable pedal with a
fixed pivot point; and the prior art was replete with pat
ents indicating that a fixed pivot point was an ideal mount
for a sensor. The idea that a designer hoping to make an
adjustable electronic pedal would ignore Asano because
Asano was designed to solve the constant ratio problem
makes little sense. A person of ordinary skill is also a
person of ordinary creativity, not an automaton.
The same constricted analysis led the Court of Appeals
to conclude, in error, that a patent claim cannot be proved
obvious merely by showing that the combination of ele
ments was “obvious to try.” Id., at 289 (internal quotation
marks omitted). When there is a design need or market
pressure to solve a problem and there are a finite number
of identified, predictable solutions, a person of ordinary
skill has good reason to pursue the known options within
his or her technical grasp. If this leads to the anticipated
success, it is likely the product not of innovation but of
ordinary skill and common sense. In that instance the fact
that a combination was obvious to try might show that it
was obvious under §103.
The Court of Appeals, finally, drew the wrong conclusion
from the risk of courts and patent examiners falling prey
to hindsight bias. A factfinder should be aware, of course,
of the distortion caused by hindsight bias and must be
cautious of arguments reliant upon ex post reasoning. See
Graham, 383 U. S., at 36 (warning against a “temptation
to read into the prior art the teachings of the invention in
issue” and instructing courts to “ ‘guard against slipping
into the use of hindsight’ ” (quoting Monroe Auto Equip
ment Co. v. Heckethorn Mfg. & Supply Co., 332 F. 2d 406,
412 (CA6 1964))). Rigid preventative rules that deny
factfinders recourse to common sense, however, are nei
ther necessary under our case law nor consistent with it.
We note the Court of Appeals has since elaborated a
18 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
broader conception of the TSM test than was applied in
the instant matter. See, e.g., DyStar Textilfarben GmbH
& Co. Deutschland KG v. C. H. Patrick Co., 464 F. 3d
1356, 1367 (2006) (“Our suggestion test is in actuality
quite flexible and not only permits, but requires, consid
eration of common knowledge and common sense”); Alza
Corp. v. Mylan Labs., Inc., 464 F. 3d 1286, 1291 (2006)
(“There is flexibility in our obviousness jurisprudence
because a motivation may be found implicitly in the prior
art. We do not have a rigid test that requires an actual
teaching to combine . . .”). Those decisions, of course, are
not now before us and do not correct the errors of law
made by the Court of Appeals in this case. The extent to
which they may describe an analysis more consistent with
our earlier precedents and our decision here is a matter
for the Court of Appeals to consider in its future cases.
What we hold is that the fundamental misunderstandings
identified above led the Court of Appeals in this case to
apply a test inconsistent with our patent law decisions.
III
When we apply the standards we have explained to the
instant facts, claim 4 must be found obvious. We agree
with and adopt the District Court’s recitation of the rele
vant prior art and its determination of the level of ordi
nary skill in the field. As did the District Court, we see
little difference between the teachings of Asano and Smith
and the adjustable electronic pedal disclosed in claim 4 of
the Engelgau patent. A person having ordinary skill in
the art could have combined Asano with a pedal position
sensor in a fashion encompassed by claim 4, and would
have seen the benefits of doing so.
A
Teleflex argues in passing that the Asano pedal cannot
be combined with a sensor in the manner described by
Cite as: 550 U. S. ____ (2007) 19
Opinion of the Court
claim 4 because of the design of Asano’s pivot mechanisms.
See Brief for Respondents 48–49, and n. 17. Therefore,
Teleflex reasons, even if adding a sensor to Asano was
obvious, that does not establish that claim 4 encompasses
obvious subject matter. This argument was not, however,
raised before the District Court. There Teleflex was con
tent to assert only that the problem motivating the inven
tion claimed by the Engelgau patent would not lead to the
solution of combining of Asano with a sensor. See Tele
flex’s Response to KSR’s Motion for Summary Judgment of
Invalidity in No. 02–74586 (ED Mich.), pp. 18–20, App.
144a–146a. It is also unclear whether the current argu
ment was raised before the Court of Appeals, where Tele
flex advanced the nonspecific, conclusory contention that
combining Asano with a sensor would not satisfy the
limitations of claim 4. See Brief for Plaintiffs-Appellants
in No. 04–1152 (CA Fed.), pp. 42–44. Teleflex’s own ex
pert declarations, moreover, do not support the point
Teleflex now raises. See Declaration of Clark J. Radcliffe,
Ph.D., Supplemental App. 204–207; Declaration of Timo
thy L. Andresen, id., at 208–210. The only statement in
either declaration that might bear on the argument is
found in the Radcliffe declaration:
“Asano . . . and Rixon . . . are complex mechanical
linkage-based devices that are expensive to produce
and assemble and difficult to package. It is exactly
these difficulties with prior art designs that [Engel
gau] resolves. The use of an adjustable pedal with a
single pivot reflecting pedal position combined with an
electronic control mounted between the support and
the adjustment assembly at that pivot was a simple,
elegant, and novel combination of features in the
Engelgau ’565 patent.” Id., at 206, ¶16.
Read in the context of the declaration as a whole this is
best interpreted to mean that Asano could not be used to
20 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
solve “[t]he problem addressed by Engelgau ’565[:] to
provide a less expensive, more quickly assembled, and
smaller package adjustable pedal assembly with electronic
control.” Id., at 205, ¶10.
The District Court found that combining Asano with a
pivot-mounted pedal position sensor fell within the scope
of claim 4. 298 F. Supp. 2d, at 592–593. Given the sigifi
cance of that finding to the District Court’s judgment, it is
apparent that Teleflex would have made clearer chal
lenges to it if it intended to preserve this claim. In light of
Teleflex’s failure to raise the argument in a clear fashion,
and the silence of the Court of Appeals on the issue, we
take the District Court’s conclusion on the point to be
correct.
B
The District Court was correct to conclude that, as of the
time Engelgau designed the subject matter in claim 4, it
was obvious to a person of ordinary skill to combine Asano
with a pivot-mounted pedal position sensor. There then
existed a marketplace that created a strong incentive to
convert mechanical pedals to electronic pedals, and the
prior art taught a number of methods for achieving this
advance. The Court of Appeals considered the issue too
narrowly by, in effect, asking whether a pedal designer
writing on a blank slate would have chosen both Asano
and a modular sensor similar to the ones used in the
Chevrolet truckline and disclosed in the ’068 patent. The
District Court employed this narrow inquiry as well,
though it reached the correct result nevertheless. The
proper question to have asked was whether a pedal de
signer of ordinary skill, facing the wide range of needs
created by developments in the field of endeavor, would
have seen a benefit to upgrading Asano with a sensor.
In automotive design, as in many other fields, the inter
action of multiple components means that changing one
Cite as: 550 U. S. ____ (2007) 21
Opinion of the Court
component often requires the others to be modified as
well. Technological developments made it clear that
engines using computer-controlled throttles would become
standard. As a result, designers might have decided to
design new pedals from scratch; but they also would have
had reason to make pre-existing pedals work with the new
engines. Indeed, upgrading its own pre-existing model led
KSR to design the pedal now accused of infringing the
Engelgau patent.
For a designer starting with Asano, the question was
where to attach the sensor. The consequent legal ques
tion, then, is whether a pedal designer of ordinary skill
starting with Asano would have found it obvious to put the
sensor on a fixed pivot point. The prior art discussed
above leads us to the conclusion that attaching the sensor
where both KSR and Engelgau put it would have been
obvious to a person of ordinary skill.
The ’936 patent taught the utility of putting the sensor
on the pedal device, not in the engine. Smith, in turn,
explained to put the sensor not on the pedal’s footpad but
instead on its support structure. And from the known
wire-chafing problems of Rixon, and Smith’s teaching that
“the pedal assemblies must not precipitate any motion in
the connecting wires,” Smith, col. 1, lines 35–37, Supple
mental App. 274, the designer would know to place the
sensor on a nonmoving part of the pedal structure. The
most obvious nonmoving point on the structure from
which a sensor can easily detect the pedal’s position is a
pivot point. The designer, accordingly, would follow Smith
in mounting the sensor on a pivot, thereby designing an
adjustable electronic pedal covered by claim 4.
Just as it was possible to begin with the objective to
upgrade Asano to work with a computer-controlled throt
tle, so too was it possible to take an adjustable electronic
pedal like Rixon and seek an improvement that would
avoid the wire-chafing problem. Following similar steps to
22 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
those just explained, a designer would learn from Smith to
avoid sensor movement and would come, thereby, to Asano
because Asano disclosed an adjustable pedal with a fixed
pivot.
Teleflex indirectly argues that the prior art taught away
from attaching a sensor to Asano because Asano in its
view is bulky, complex, and expensive. The only evidence
Teleflex marshals in support of this argument, however, is
the Radcliffe declaration, which merely indicates that
Asano would not have solved Engelgau’s goal of making a
small, simple, and inexpensive pedal. What the declara
tion does not indicate is that Asano was somehow so
flawed that there was no reason to upgrade it, or pedals
like it, to be compatible with modern engines. Indeed,
Teleflex’s own declarations refute this conclusion. Dr.
Radcliffe states that Rixon suffered from the same bulk
and complexity as did Asano. See id., at 206. Teleflex’s
other expert, however, explained that Rixon was itself
designed by adding a sensor to a pre-existing mechanical
pedal. See id., at 209. If Rixon’s base pedal was not too
flawed to upgrade, then Dr. Radcliffe’s declaration does
not show Asano was either. Teleflex may have made a
plausible argument that Asano is inefficient as compared
to Engelgau’s preferred embodiment, but to judge Asano
against Engelgau would be to engage in the very hindsight
bias Teleflex rightly urges must be avoided. Accordingly,
Teleflex has not shown anything in the prior art that
taught away from the use of Asano.
Like the District Court, finally, we conclude Teleflex has
shown no secondary factors to dislodge the determination
that claim 4 is obvious. Proper application of Graham and
our other precedents to these facts therefore leads to the
conclusion that claim 4 encompassed obvious subject
matter. As a result, the claim fails to meet the require
ment of §103.
We need not reach the question whether the failure to
Cite as: 550 U. S. ____ (2007) 23
Opinion of the Court
disclose Asano during the prosecution of Engelgau voids
the presumption of validity given to issued patents, for
claim 4 is obvious despite the presumption. We neverthe
less think it appropriate to note that the rationale under
lying the presumption—that the PTO, in its expertise, has
approved the claim—seems much diminished here.
IV
A separate ground the Court of Appeals gave for revers
ing the order for summary judgment was the existence of a
dispute over an issue of material fact. We disagree with
the Court of Appeals on this point as well. To the extent
the court understood the Graham approach to exclude the
possibility of summary judgment when an expert provides
a conclusory affidavit addressing the question of obvious
ness, it misunderstood the role expert testimony plays in
the analysis. In considering summary judgment on that
question the district court can and should take into ac
count expert testimony, which may resolve or keep open
certain questions of fact. That is not the end of the issue,
however. The ultimate judgment of obviousness is a legal
determination. Graham, 383 U. S., at 17. Where, as here,
the content of the prior art, the scope of the patent claim,
and the level of ordinary skill in the art are not in mate
rial dispute, and the obviousness of the claim is apparent
in light of these factors, summary judgment is appropri
ate. Nothing in the declarations proffered by Teleflex
prevented the District Court from reaching the careful
conclusions underlying its order for summary judgment in
this case.
* * *
We build and create by bringing to the tangible and
palpable reality around us new works based on instinct,
simple logic, ordinary inferences, extraordinary ideas, and
sometimes even genius. These advances, once part of our
24 KSR INT’L CO. v. TELEFLEX INC.
Opinion of the Court
shared knowledge, define a new threshold from which
innovation starts once more. And as progress beginning
from higher levels of achievement is expected in the nor
mal course, the results of ordinary innovation are not the
subject of exclusive rights under the patent laws. Were it
otherwise patents might stifle, rather than promote, the
progress of useful arts. See U. S. Const., Art. I, §8, cl. 8.
These premises led to the bar on patents claiming obvious
subject matter established in Hotchkiss and codified in
§103. Application of the bar must not be confined within a
test or formulation too constrained to serve its purpose.
KSR provided convincing evidence that mounting a
modular sensor on a fixed pivot point of the Asano pedal
was a design step well within the grasp of a person of
ordinary skill in the relevant art. Its arguments, and the
record, demonstrate that claim 4 of the Engelgau patent is
obvious. In rejecting the District Court’s rulings, the
Court of Appeals analyzed the issue in a narrow, rigid
manner inconsistent with §103 and our precedents. The
judgment of the Court of Appeals is reversed, and the case
remanded for further proceedings consistent with this
opinion.
It is so ordered.