This appeal is taken in a suit under Rev.Stat. § 4915 (1875), as amended, to> obtain issuance of a patent. 1
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On September 16, 1938, plaintiff-appellant Smith filed an application with the Patent Office entitled “Gas Detector for Drilling-Muds.”
2
Some months later, John T. Hayward filed an application for a claimed invention of similar nature. An interference proceeding (No. 81,858) was thereafter initiated in the Patent Office, on four stated counts. The Board of Interference Examiners ruled in favor of Hayward, and Smith appealed to the United States Court of Customs and Patent Appeals. That court affirmed. Smith v. Hayward, 1949,
We think it clear that an applicant who has been finally adjudicated not to be the first inventor of subject matter common to his application and the similar application of another claimant cannot thereafter obtain a patent for ■either that subject matter or for claims which define nothing patentable over that subject matter. United States Rubber Co. v. Coe, 1945,
Appellant lays particular stress on his Claim 12, a claim which was held in the Patent Office to be not patentable to Hayward. He urges that the decision in the interference cannot be res judicata as to claims which Hayward could not make, citing Daniels v. Coe, 1940,
Appellant does not here challenge the validity of Hayward’s patent: he urges that he also is entitled to one. But there can be no peaceful co-existence of patents covering the same subject matter.
It is unnecessary to pass on the remaining contentions of the parties. For the reasons given above, the judgment of the District Court will be
Affirmed.
Notes
. Rev.Stat. § 4915 (1875), as amended, 35 U.S.C. § 63 (1946), was repealed by the Act of July 19, 1952, c. 950, Section 5, 66 Stat. 815, and was replaced. to the extent here pertinent, by 66 Stat-803, 35 U.S.C. § 145 (1952).
. Serial No. 230,274.
. The Primary Examiner had previously stated, in the declaration of interference, that in the event of an award of priority adverse to Smith in the interference proceeding, his remaining claims (those not directly involved in that proceeding) would be held subject to rejection.
