JONES, Senior Judge:
This is an appeal from a judgment of the United States District Court for the Southern District of California, Central Division (now the Central District), which held that Patent No. 2,543,143 owned by appellant Evans Products Company, was invalid, and that it was not infringed by the accused devices of appellee Preco Incorporated.
Jurisdiction was conferred on the district court by 28 U.S.C. §§ 1338, 1391, 1400(b), and 2201...
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