The inventor states at the outset that his method is an improvement upon the well-known chemical processes of exhausting the bulb. These processes require the expenditure of considerable time in order to secure the desired perfection in the vacuum necessary to preserve the filament for any extended period. They introduced in the tube of the vacuum inclosure a chemical which will readily combine when heated with the remnant of gases which are released during the final incandescence of the filament.
In the ordinary way of using these processes the selected chemical is placed in the tubulature of the lamp and after the desired vacuum is obtained.the tubulature is sealed below the chemical. The filament is then brought to intensive incandescence and the chemical heated to drive vapors in the bulb which by combination perfect the vacuum. The tube is then sealed above the chemical, the superfluous portion of the tube is removed and the lam]) is ready for use. The specification asserts that this process was objectionable for the reason, among others, that the application of heat to the tube in the first sealing is apt to volatilize too much of the chemical, tending to discolor the bulb of the lamp. Again, it is impossible to seize the definite moment of best exhaustion with the old method of producing the first sealing off of the lamp. There was also more or less loss from collapse of the tubes, permitting air to enter the bulb. These objections the patentee remedies by his method which consists in employing a very thick and substantial rubber tubing which is slipped over the pipe leading to the pump and into the end of which the lamp tubulature is inserted .after the chemical lias been placed therein. This connection is closed at the right moment by a pinch-cock, thus maintaining the vacuum unim*998paired for a period long enough to effect the final exhaustion of the lamp by chemical means. After the connection to the pump is closed the lamp filament is brought to incandescence and after an almost complete vacuum is secured the tube is sealed off and the lamp is completed in the usual way.
“Tlie essence of tlie invention therefore consists in closing the connection between the lamps and the pump without the use of heat, so that an excess of tlie chemical used to perfect the vacuum is not volatilized.”
The claims involved are as follows:
“1. The process of exhausting incandescent lamp bulbs to form a high vacuum herein set out, which consists in connecting tlie tubulature containing a suitable chemical to the pumps, exhausting to the desired degree, then closing the pump connection below the chemical without the use of lieat, then bringing tiie filament to incandescence and causing the chemical to react on the remnant gases, and then sealing the lamp between the chemical and the bulb.
“2. Tlie method of exhausting lamp-bulbs to form a high vacuum, which consists in inserting a chemical exhausting agent in an (extended open-ended tube leading from the bulb, exhausting tlie bulb through said tube to tlie desired degree by treatment on tlie pumps, closing tlie pump connection below the chemical without heating the tube, bringing tlie filament to incandescence, then heating the chemical to volatilize a small portion thereof and completing the exhaustion by its reaction on the remnant gases, and finally sealing the lamp between the chemical and bulb, as set forth.”
The defenses relied on are lack of patentability and non-infringement.
Notwithstanding the formidable and, at times, well-nigh incomprehensible nomenclature of the electric lighting art, the invention is, in fact, an exceedingly simple one. 1’t is not a fundamental invention, it did not revolutionize the art, but, by the substitution of an ordinary pinch-cock for heat in closing the connection between tlie lamp and the pump, it has accomplished a most useful and beneficial result with a corresponding economy of time, labor and material. ■
The patent purports to be, and is, an improvement upon tlie invention of Arturo Malignani for a process of evacuating incandescent lamps. This patent is sufficiently described in Malignani v. Germania Go. (C. C.) 169 Fed. 299, and need not be discussed here further than to say that the process of the patent in suit is Malignani’s process with the substitution of tlie pinch-cock for the soldering of tlie lower end of the tube by heat.
The fact that the invention is simple and that at tlie present time it seems as if it might have been obvious to the workers in this art, does not militate against its validity. Many of the most useful inventions depend upon equally simple changes.
The important question is — what does the invention do?
Tested by results we think it quite clear that the patent discloses patentable novelty. The testimony shows that the Howell process saves time, material and the use of skilled labor. It makes better and cheaper lamps and more of them, avoids discoloration of the bulbs and permits an instantaneous and controllable closure. These are some, but not all, of the practical results obtained by using tlie patented method and we find nothing in the record which anticipates or limits *999the claims. The defendant offered no oral testimony but introduced several patents and publications. An extract from a paper by Herman Sprengal on “Researches on the Vacuum" being the one upon which principal reliance is placed. The description and drawings, so lar as we are able to understand them, show a complicated and awkward apparatus absolutely incapable of use in the art now under discussion. It avails nothing to prove that rubber tubes, pinch-cocks and exhaust pumps were old, unless it be shown that they were combined to produce the result of the Howell patent. We think nothing in the record shows that they were.
The Circuit Court dismissed the bill on the ground of non-infringement, holding that the process calls for a fixed series of steps and that the defendant does not follow the precise sequence as stated in the claims.
The court finds' that the third step in the process is “closing the pump connection at a point between the chemical and the pump” and the fourth step is “incandescing the filament.” The conclusion is therefore reached that the defendant does not use. the process because it brings the filament to incandescence before closing the pump.
We are constrained to think that this is too strict an interpretation of the claims. If it appeared that the process was in the least dependent upon the closing of the pump prior to incandescing there would he more force in the contention, but it docs not so appear. In order to describe intelligently the method practiced by him it was necessan' for the patentee to state the various steps taken. When he reached the two steps in question he was compelled to mention one before the other although he might have reversed the order with equal propriety, fn other words closing before incandescing is not of the essence of the invention.
Suppose that in a chemical patent the inventor, after describing the compound to be filtered should claim a process, the third and fourth steps being to place the compound on the filter bed and insert the bed in the filter. Could a user of the process escape the charge of infringment by showing that he inserted the bed in the filter and then placed the compound upon it? We think not. Very few patents could survive so illiberal a construction as is contended for by the defendant. A similar question arose in the Malignani Case supra, and we agree with Judge Cross in saving:
“The defendant does not avoid infringement b.v merely transposing the steps of the process. Transposition of (lie various steps is, under such circumstances, mere evasion.”
In Hammerschlag v. Bancroft (C. C.) 32 Fed. 585, Judge Gresham says:
“The defendant may not observe the same order in the various steps of the process that we find described in the reissued patent, but it does not follow fhar the processes are different because Ihe various steps do net succeed each other in precisely the same order.”.
Assuming, therefore, that the defendant makes the asserted transposition, a proposition which is by no means clear on the proof, we are. satisfied that infringtneut is not thus avoided.
*1000The decree is reversed with costs and the cause is remanded to the Circuit Court with instructions to enter the usual decree for the complainant.