Frank Jardine and James Cooper, the appellants, filed their application in the United States Patent Office for a patent on improvements in bimetallic pistons for internal combustion engines on January 7, 1926. As a result of the proceedings in the Patent Office, claims 4, 5, 7, 19, 20, 21, 29, 30, and 31 were allowed, and claims 13, 22, 23, 25, 26, 27, 28, 32, 33, 34, 35, 36, and 37 were rejected....
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