STEPHENS, Circuit Judge.
Carl A. Hillgren is the holder of United States Letters Patent No. 2,403,597, issued July 9, 1946, for an invention of a "Door Lock". Kwikset Locks, Inc., is the owner of United States Letters Patent No. 2,489,160, issued to Adolf Schoepe and Albert S. Lord, jointly, on October 20, 1947, on a "Doorknob and Method of Making Same", and assigned to Kwikset on November 22, 1949. Hillgren brought suit in the United States District Court for the...
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