CASTLE, Circuit Judge.
Serge A. Scherbatskoy, plaintiff-appellant, as assignee of Jacob Neufeld's Patent No. 2,496,103, brought suit in the District Court charging Sperry Rand Corporation and its lessee, United States Steel Corporation, defendants-appellees, with infringement and seeking an accounting and damages. The defendants by their Answer and Counterclaim for Declaratory Judgment asserted invalidity of the patent and denied infringement. On trial of the issues...
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