This is an appeal.from a decision of the Patent Office in an interference proceeding awarding priority to the senior party. The claims, two in number, relate to a process of increasing or maintaining the amount of enitrocotton dissolved in nitrocellulose solutions, while maintaining a degree of fluidity sufficient to permit the use of the solution as a spray or lacquer. There are two important limitations; that the claims involve a process for dealing with highly concentrated solutions, and for changing them to a fluidity -sufficient for their use as a lacquer or spray. Claim No. 1 is sufficiently illustrative and reads as follows; “1. A process for making highly concentrated solutions of nitrocellulose having sufficient fluidity to , be used as a lacquer or spray, which consists in treating a mixture of nitrocotton and solvent with heat and pressure.” It clearly appears that the senior party established a constructive filing date of December 6, 1918, by reason of the filing of a Swedish application for the same invention. He' therefore is entitled to, and was given, that date for conception and constructive reduction to practice. The Examiner of Interferences held that Phillips, while first to conceive, was the last to reduce to practice, and was lacking in diligence, and therefore awarded priority to the senior party. The Board found that Phillips conceived and reduced to practice in 1914, and that, as he neither abandoned nor concealed the invention thereafter, he was entitled to an award of priority, and so ruled. The Assistant Commissioner, in a carefully prepared opinion, concurred in the findings of the Examiner of Interferences, and, after an examination of the record in the light of appellant’s argument and brief, we are convinced of the correctness of the conclusion reached. The opinion of the Assistant Commissioner is so comprehensive and satisfactory that we adopt it, without further discussion, and therefore affirm the decision. Affirmed.