BALDWIN, Circuit Judge.
This is an appeal by E.I. du Pont De Nemours & Co. and its customer Alamo Explosives Co., Inc. (collectively, "Du Pont"). The appeal is from a final judgment of the United States District Court for the Northern District of Texas holding product claims 1-5, 7, 12-14, and 16-17 of U.S. Patent No. 3,447,978 ('978 patent), issued to Harold Bluhm on June 3, 1969 and assigned to the Atlas Powder Co. ("Atlas"), not invalid under 35 U.S.C. §...
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