This appeal is from the decision of the Patent and Trademark Office (PTO) Board of Appeals (board) sustaining rejection of claims 1, 5,17, and 18, all remaining claims in application Serial No. 937,574 for “Induction of Immunological Tolerance.” The subject application is a divisional application of application Serial No. 764,586, filed February 3, 1977, and is entitled to that filing date. The claims were rejected because of a description of the subject matter of the invention in a publication dated June 1976, which appellant, however, asserts is a description of his own work. The board was unpersuaded by appellant’s declarations to that effect and sustained the rejection. We reverse.
Background
In June, 1976, eight months before appellant’s effective filing date, an article coauthored by Nicholas Chiorazzi, Zelig Eshhar and appellant was published in the Proceedings of the National Academy of Science, U.S.A., Vol. 73, No. 6, pp. 2091-95. There is no dispute that the article (Chiorazzi et al.) fully describes the claimed invention.
Along with his divisional application, appellant filed a declaration in which he declared that:
He is the sole inventor of the subject matter described and claimed in the United States Patent Application Serial No. 764,586, filed February 3, 1977, entitled, INDUCTION OF IMMUNOLOGICAL TOLERANCE, which subject matter is disclosed and claimed in part in the divisional application with which this declaration is submitted.
He is co-author of a report in the proceedings of the National Academy of Science, U.S.A., Volume 73, No. 6, Pages 2091-2095, June, 1976, communicated to the National Academy of Science by Albert H. Coons, a member of said Academy, on March 8, 1976, that he is the sole inventor of the subject matter which is disclosed in said publication in the proceedings of the National Academy of Science and disclosed and claimed in the application submitted herewith. [Emphasis ours.]
The other authors of the publication, Nicholas Chiorazzi and Zelig Eshhar were students working under the direction and supervision of the inventor, Dr. David H. Katz, and while co-authoring the publication, are not co-inventors of the subject matter described therein.
The Examiner’s Rejections
In his first Official Action, the examiner stated:
Claims 1, 5, 17 and 18 are rejected under 35 USC 102(g) as anticipated by Chiorazzi et al. ... Applicant’s declaration ... is entirely ineffective in overcoming the rejection of this nature and is considered to be nothing more than the self-serving statement.
In his Final Official Action, the examiner adhered to the § 102(g) rejection adding:
[T]here is no evidence of record which makes it clear that appellant is the sole *453inventor of the chimed invention .... Where a reference is from a collection of authors, it must be assumed that all authors contributed equally even though it is recognized that sometimes individuals involved only with assay and testing features of the invention and . .. not involved in the conceptial [sic] aspect of the research are included as an author to a particular reference. There is not sufficient evidence of record to show that applicant is the sole inventor of the claimed invention. * * * * * *
... The publication date as well as communication date of the reference, both dates being prior to applicant’s filing date, [are] clear evidence to [sic] prior invention. [Emphasis in original].
To overcome the rejection, the examiner required that appellant either (1) amend his application to include the other authors as coinventors, or (2) file affidavits from the other authors “disclaiming the invention claimed.” Appellant chose to appeal rather than comply with either requirement.
The Board’s Affirmance
While the board sustained the examiner’s rejection, it did so on the following ground:
The Chiorazzi et al. article, as pointed out by the examiner and as acknowledged by appellant, fully describes the presently claimed therapeutic immuno-suppressive agent and the method of preparing same. In view of the fact that the article was published some eight months prior to the effective filing date of the present application and since the authors of the article are legally another within the meaning of Section 102(a), we are satisfied that the examiner has clearly established a prima facie case of lack of novelty of the presently claimed therapeutic agent and method.
Appellant, who is a coauthor of the Chiorazzi article, has stated under oath that he is the sole inventor of the subject matter herein claimed and described in the article, and that the other authors, namely, Chiorazzi and Eshhar, are not coinventors but were simply students working under his direction and supervision. In appellant’s view, this declaration constitutes legally acceptable evidence and, in the absence of evidence to the contrary, is sufficient to establish that he is the sole inventor of the subject matter in issue.
However, we do not find this declaration, standing alone, sufficient to establish that Katz is the sole inventor and thus remove the Chiorazzi article as a reference against the presently claimed subject matter. Although appellant may be of the opinion that he is the sole inventor, such a view may not be shared by the coauthors of this article. Coauthors Chiorazzi and Eshhar may, in fact, be of the opinion that they are, at the very least, coinventors of the subject matter described in the article and claimed herein. Even though authorship may not conclusively establish inventor-ship, it is reasonable to infer that such a relationship exists. Appellant’s unsupported statement, even though under oath, does not convince us otherwise. In our view, disclaiming affidavits or declarations by the other authors are required in order to support appellant’s contention that he is the sole inventor of the subject matter described in the Chiorazzi article and claimed here. [Emphasis ours.]
The board adhered to its position on rehearing.
OPINION
Because the board did not specifically reverse the § 102(g) rejection, we treat it as having been affirmed. 37 CFR 1.196(a). Further, since appellant does not contend that the board’s reliance on § 102(a) is a new ground for rejection, we will also consider that section. 37 CFR 1.196(b). Appellant does suggest that the board apparently confused § 102(e) with § 102(a) since § 102(a) makes no reference to “another” in the context of authorship of a publication. However, we disagree that the board was “confused” in this respect for reasons which will become apparent and, accordingly, do not find it necessary to consider § 102(e) separately.
*454 35 U.S.C. § 102(g)
Section 102(g) reads:
A person shall be entitled to a patent unless— ******
(g) before the applicant’s invention thereof the invention was made in this country by another who had not abandoned, suppressed, or concealed it. In determining priority of invention there shall be considered not only the respective dates of conception and reduction to practice of the invention, but also the reasonable diligence of one who was first to conceive and last to reduce to practice, from a time prior to conception by the other.
This section of the statute embodies the principle that to be entitled to a patent one must be the first to have made the invention. However, prior conception of the invention by another does not defeat one’s right. No possible barrier is created by § 102(g) unless another has either actually reduced the invention to practice or has constructively reduced it to practice by filing a patent application.
We specifically reject the examiner’s position that the publication of the subject article provides even a tenuous ground for rejection under 35 U.S.C. § 102(g). Unlike the filing of a patent application, the publication of an article is not deemed a constructive reduction to practice of the subject matter described therein. In re Schlittler, 43 CCPA 986, 989, 234 F.2d 882, 884, 110 USPQ 304, 305-06 (1956). Therefore, disclosure in a publication does not prove that any “invention” within the meaning of 102(g) has ever been made by anyone. The examiner’s ground for rejection must, therefore, fail.
35 U.S.C. § 102(a)
Section 102(a) reads:
A person shall be entitled to a patent unless—
(a) the invention was known or used by others in this country, or patented or described in a printed publication in this or a foreign country, before the invention thereof by the applicant for patent.
It may not be readily apparent from the statutory language that a printed publication cannot stand as a reference under § 102(a) unless it is describing the work of another. A literal reading might appear to make a prior patent or printed publication “prior art” even though the disclosure is that of the applicant’s own work. However, such an interpretation of this section of the statute would negate the one year period afforded under § 102(b)1 during which an inventor is allowed to perfect, develop and apply for a patent on his invention and publish descriptions of it if he wishes. Illinois Tool v. Solo Cup Co., 461 F.2d 265, 172 USPQ 385 (CA 7), cert. denied, 407 U.S. 916, 92 S.Ct. 2441, 32 L.Ed.2d 691 (1972).
Thus, one’s own work is not prior art under § 102(a) even though it has been disclosed to the public in a manner or form which otherwise would fall under § 102(a). Disclosure to the public of one’s own work constitutes a bar to the grant of a patent claiming the subject matter so disclosed (or subject matter obvious therefrom) only when the disclosure occurred more than one year prior to the date of the application, that is, when the disclosure creates a one-year time bar, frequently termed a “statutory bar,” to the application under § 102(b). As stated by this court in In re Facius, 56 CCPA 1348, 1358, 408 F.2d 1396, 1406, 161 USPQ 294, 302 (1969), “But certainly one’s own invention, whatever the form of disclosure to the public, may not be prior art against oneself, absent a statutory bar." [Emphasis in original.]2
*455Since the publication in this case occurred less than one year before appellant’s application, the disclosure comes within the scope of § 102(a) only if the description is not of appellant’s own work.
The specific question present in this appeal is essentially an evidentiary one, namely, the sufficiency of applicant’s showing to establish that the subject disclosure was his original work, and his alone.3 We conclude that appellant’s declaration is sufficient in this case to overcome the rejection.
As an initial matter, we hold that authorship of an article by itself does not raise a presumption of inventorship with respect to the subject matter disclosed in the article. Thus, co-authors may not be presumed to be coinventors merely from the fact of co-authorship. On the other hand, when the PTO is aware of a printed publication, which describes the subject matter of the claimed invention and is published before an application is filed (the only date of invention on which it must act in the absence of other proof), the article may or may not raise a substantial question whether the applicant is the inventor. For example, if the author (whether he is the applicant or not) specifically states that he is describing the work of the applicant, no question at all is raised. The content and nature of the printed publication, as well as the circumstances surrounding its publication, not merely its authorship, must be considered.
What we have in this case is ambiguity created by the printed publication.4 The article does not tell us anything specific about inventorship, and appellant is only one of three authors who are reporting on scientific work in which they have all been engaged in some capacity at the Harvard Medical School. It was incumbent, therefore, on appellant to provide a satisfactory showing which would lead to a reasonable conclusion that he is the sole inventor.
The board and the examiner held that “disclaiming affidavits or declarations by the other authors are required to support appellant’s position that he is, in fact, the sole inventor of the subject matter described in the article and claimed herein.” This was clear error. Submission of such affidavits or declarations would have ended the inquiry, but we do not agree that they are required by the statute or Rule 132. What is required is a reasonable showing supporting the basis for the applicant’s position.
In this case, appellant reaverred in his declaration that he is the sole inventor of the subject matter described and claimed in his application and also that disclosed in the publication of proceedings of the National Academy of Science. We do not view this averment as a mere pro forma restatement of the oath in his application.
In the declaration, appellant provides the explanation that the co-authors of the publication, Chiorazzi and Eshhar, “were students working under the direction and supervision of the inventor, Dr. David H. Katz.” This statement is of significance since it provides a clear alternative conclusion to the board’s inference that their names were on the article because they were coinventors. As acknowledged by the examiner, the names of individuals may be given as authors of a scientific report who are “involved only with assay and testing features of the invention.” Appellant’s explanation is, thus, consistent not only with the content of the article but with the nature of the publication. On the record here, the board should not have engaged in further speculation as to whether appellant’s view was shared by his co-authors but rather should have accepted that Chiorazzi and *456Eshhar were acting in the capacity indicated, that is, students working under the direction and supervision of appellant. From such a relationship, joint inventorship cannot be inferred in the face of sworn statements to the contrary.
Thus, we conclude that in view of the totality of circumstances, appellant has made a sufficient showing that the cited publication discloses his invention. Accordingly, we reverse the decision of the board.
REVERSED.
. 35 U.S.C. § 102(b) provides:
A person shall be entitled to a patent unless— ******
(b) the invention was patented or described in a printed publication in this or a foreign country or in public use or on sale in this country, more than one year prior to the date of the application for patent in the United States. [Emphasis added.]
. Since any valid rejection is necessarily a “statutory bar,” in a generic sense, the expression “statutory bar” must be understood here as meaning “statutory time bar” under 35 U.S.C. § 102(b).
. Such showing can be made under Rule 132, 37 CFR 1.132, which provides:
When any claim of an application is rejected on reference to a ... printed publication ... affidavits or declarations traversing [the reference] ... may be received.
. The solicitor notes that in the application, there is an inconsistency in that the subject application and its parent by a sole inventor refer to previous work done by “one of the inventors.” While adding to the ambiguity, this statement, which appellant’s attorney represents was his error in draftsmanship, does not control over appellant’s subsequent proofs.