OPINION
FREEMAN, Chief Judge.
This is a declaratory judgment action brought by Sterling Products Company, Inc., a Minnesota corporation, seeking a determination that patent No. 3,109,537, issued to defendant Daniel C. Larkin, for a removable trash receptacle to be used in an automobile, is invalid because the claimed invention was 1) obvious to one reasonably skilled in the art (35 U.S.C. § 103) and 2) on sale, in public use, or described in a printed...
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