BARNES, Circuit Judge:
This appeal arises from a district court judgment adverse to plaintiff-appellant, Cataphote Corporation, in a patent infringement suit instituted against defendant-appellee, De Soto Chemical Coatings, Incorporated.
The district court had jurisdiction pursuant to 28 U.S.C. § 1338. This court has jurisdiction pursuant to 28 U.S.C. § 1291.
The district court held appellant's patent claim invalid...
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