This is an appeal from the decision of the U.S. Patent and Trademark Office ("PTO") Board of Appeals ("board") sustaining the final rejection of appellant's claims1 1, 2, 5, 6, 7, 25, and 28. We affirm.

The subject matter of this appeal was previously before this court's predecessor in In re Donohue, 632 F.2d 123, 207 U.S.P.Q. (BNA) 196 (CCPA 1980) ("Donohue I ").2 There is no need to discuss the details of that opinion; however, a summary of the pertinent facts is appropriate for a full understanding of the issues before us.

The present invention relates to 2,2',6,6'-tetramethylbiphenyl-4,4'-dicarboxylic acid compounds which are suitable for producing polymers used to form shaped objects, such as film, fibers, or molded parts. Claim 1, which is the sole independent claim on appeal, is illustrative:

2,2',6,6'-tetramethylbiphenyl-4,4'-dicarboxylic acid compound comprising said acid, an acyl halide derivative thereof, or a simple ester thereof.

The PTO has rejected all the appealed claims under 35 U.S.C. Sec. 102(b) "as anticipated by Nomura [et al.], optionally in view of Lincoln and Walker [et al.]."

Nomura et al. ("Nomura")3 discloses twelve 2,2',6,6'-tetramethylbiphenyls ("TMBP") which are 4,4'-disubstituted with NH2 , NMe2 , OH, OMe, Cl, Br, I, CO2 H, CO2 Me, CN, NO2 , or H substituents. Methods of preparing all these compounds, except those disubstituted with CO2 H or CO2 Me, are set forth in Nomura. Nomura's disclosure of how to make 4,4'-dinitrile (or dicyano) TMBP is particularly significant, because Lincoln⁴ and Wagner et al. ("Wagner")5 teach, generally, the preparation of carboxylic acids from nitriles by hydrolysis.

In Donohue I, a majority of the Court of Customs and Patent Appeals ("CCPA") affirmed the PTO's rejection of appealed claims 1, 5, 6, and 76 under 35 U.S.C. Sec. 102(b). Id. at 127, 207 USPQ at 200. The basis for the rejection was, as it is here, Nomura with reference to Lincoln and Wagner. Id. at 126, 207 USPQ at 199.

A minority of the CCPA voted to reverse the PTO's decision, because they concluded it was uncertain from the text of Nomura that the dicarboxylic acid TMBP and dimethyl ester TMBP were ever prepared. Id. at 129, 207 USPQ at 201. Accordingly, Nomura's disclosure was, in the minority's view, no more than a mere naming of the claimed compounds which is insufficient to constitute an enabling disclosure. Id. at 129, 207 USPQ at 201.

After Donohue I, the presently-appealed application was filed. During prosecution before the PTO, appellant submitted an affidavit under 37 C.F.R. Sec. 1.132 executed by Dr. Ellis K. Fields ("Fields affidavit"). In this affidavit, Dr. Fields states that he wrote to Dr. Yoshito Takeuchi, one of the authors of Nomura, to ask whether the disclosed dicarboxylic acid TMBP or dimethyl ester TMBP compounds were ever synthesized, as indicated in Nomura. Dr. Takeuchi responded by stating that these compounds were not synthesized, and Dr. Fields submitted his affidavit to that effect.

Despite the Fields affidavit, the examiner finally rejected the claims, and an appeal to the board was filed. The board affirmed the rejection of the claims on the grounds stated supra, holding that it was bound by Donohue I. As to the Fields affidavit, the board held that whether the authors of Nomura actually prepared the claimed compounds is not "material or relevant"; rather, the key factor in evaluating the adequacy of a reference's disclosure was deemed to be whether that disclosure would have been enabling, and the board determined that the CCPA had decided that question with respect to Nomura.

Appellant has made a record different from that in Donohue I by submitting the Fields affidavit. This new record presents a new issue of patentability with respect to whether the previously-sustained anticipation rejection can still be maintained. In view of this new issue, the PTO properly declined to make a formal res judicata rejection and addressed the question of whether the Fields affidavit overcomes the rejection of the claims based on Nomura. See In re Ackermann, 444 F.2d 1172, 1176, 170 U.S.P.Q. (BNA) 340, 343 (CCPA 1971); In re Russell, 439 F.2d 1228, 1230, 169 U.S.P.Q. (BNA) 426, 428 (CCPA 1971); In re Herr, 377 F.2d 610, 611, 153 U.S.P.Q. (BNA) 548, 549 (CCPA 1967).

Appellant argues that the Fields affidavit, which states that the authors of Nomura did not make the disclosed dicarboxylic acid TMBP and dimethyl ester TMBP compounds, overcomes the PTO's rejection. It is urged that Donohue I and In re Samour, 571 F.2d 559, 197 U.S.P.Q. (BNA) 1 (CCPA 1978), require, inter alia, that a 35 U.S.C. Sec. 102(b) rejection based on a primary reference disclosing a claimed compound in conjunction with one or more references which teach how to make that compound, should be sustained only if the claimed compound was actually made. We disagree.

It is well settled that prior art under 35 U.S.C. Sec. 102(v) must sufficiently describe the claimed invention to have placed the public in possession of it.7 In re Sasse, 629 F.2d 675, 681, 207 U.S.P.Q. (BNA) 107, 111 (CCPA 1980); In re Samour, 571 F.2d at 562, 197 USPQ at 4; see also Reading & Bates Construction Co. v. Baker Energy Resources Corp., 748 F.2d 645, 651-52, 223 U.S.P.Q. (BNA) 1168, 1173 (Fed.Cir.1984). Such possession is effected if one of ordinary skill in the art could have combined the publication's description of the invention with his own knowledge to make the claimed invention. See In re LeGrice, 301 F.2d at 939, 133 USPQ at 373-74. Accordingly, even if the claimed invention is disclosed in a printed publication, that disclosure will not suffice as prior art if it was not enabling. In re Borst, 345 F.2d 851, 855, 145 U.S.P.Q. (BNA) 554, 557 (CCPA 1965), cert. denied, 382 U.S. 973, 86 S. Ct. 537, 15 L. Ed. 2d 465 (1966). It is not, however, necessary that an invention disclosed in a publication shall have actually been made in order to satisfy the enablement requirement.

In re Wiggins, 488 F.2d 538, 179 U.S.P.Q. (BNA) 421 (CCPA 1973) and In re Sheppard, 339 F.2d 238, 144 U.S.P.Q. (BNA) 42 (CCPA 1964), do not support a contrary view. In those cases, the references were deemed insufficient, because they stated that attempts to prepare the claimed compounds were unsuccessful. Such failures by those skilled in the art (having possession of the information disclosed by the publication) are strong evidence that the disclosure of the publication was nonenabling. By contrast, the fact that the author of a publication did not attempt to make his disclosed invention does not indicate one way or the other whether the publication would have been enabling.

Although In re Samour and Donohue I mention that the claimed invention in each case was apparently produced in conjunction with the anticipatory reference, this is a far cry from proclaiming that such production is required to meet the enablement requirement. In re Samour, in fact, states:

[W]hether or not [the claimed invention] has been made previously is not essential to a determination that a method of preparing it would have been known by, or would have been obvious to, one of ordinary skill in the art.

571 F.2d at 563 n. 6, 197 U.S.P.Q. (BNA) at 4 n. 6. Therefore, the statements in In re Samour and Donohue I that the claimed invention was made previously serve to point out the absence of any strong evidence of nonenablement as in Wiggins and Sheppard. See In re Donohue, 632 F.2d at 126 n. 6, 207 U.S.P.Q. (BNA) at 199 n. 6.

At oral argument, appellant also challenged the correctness of the CCPA's holding in In re Samour and Donohue I that several references can be used together to support an anticipation rejection. However, we are bound by the CCPA's decision in those cases. South Corp. v. United States, 690 F.2d 1368, 1370-71, 215 U.S.P.Q. (BNA) 657, 658 (Fed.Cir.1982) (in banc). At the same time, we have no difficulty with the rejections made in In re Samour and Donohue I.

It is elementary that an anticipation rejection requires a showing that each limitation of a claim must be found in a single reference, practice, or device. E.g., Kalman v. Kimberly-Clark Corp., 713 F.2d 760, 771, 218 U.S.P.Q. (BNA) 781, 789 (Fed.Cir.1983), cert. denied, --- U.S. ----, 104 S. Ct. 1284, 79 L. Ed. 2d 687 (1984). The anticipation rejection used here, as in In re Samour and Donohue I, is not inconsistent with this rule. See In re Marshall, 578 F.2d 301, 304, 198 U.S.P.Q. (BNA) 344, 346 (CCPA 1978). The additional references utilized in this case (viz., Lincoln and Wagner) are not relied upon for suggestion or motivation to combine teachings to meet the claim limitations, as in rejections under 35 U.S.C. Sec. 103. In re Samour, 571 F.2d at 563, 197 USPQ at 4-5. Such reliance would be pointless, because Nomura alone discloses every element claimed. The purpose of citing Lincoln and Wagner is, instead, to show that the claimed subject matter, as disclosed in Nomura, was in the public's possession. Id. Therefore, the anticipation rejection based on Nomura, Lincoln, and Wagner is proper.8

Appellant also argues that the references fail to teach the solubility characteristics and melting point range set forth in dependent claims 25 and 28, respectively.9 However, where, as here, the dicarboxylic acid TMBP and dimethyl ester TMBP of Nomura are identical to the claimed invention, the properties of Nomura's compounds are inherently the same as those of the claimed invention in the absence of proof to the contrary. See In re Best, 562 F.2d 1252, 1255, 195 U.S.P.Q. (BNA) 430, 433-34 (CCPA 1977).

In view of the foregoing, the board's decision is affirmed.