SWYGERT, Circuit Judge.
Plaintiff, National Coupling Company, of Fort Wayne, Indiana, filed a declaratory judgment action against defendant, Press-Seal Gasket Corporation, also of Fort Wayne, in which it asked a declaration that it is not infringing United States Patent Re. 24,799, granted to Joseph E. Miller and owned by Press-Seal, for a gasket and pipe end construction for bell and spigot pipe. Plaintiff also requested the patent be declared invalid. It further...
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