Charles W. Strzalkowski, and Auros Electronic Corporation v. Beltone Electronics Corporation

CASTLE, Circuit Judge.

Charles W. Strzalkowski, the owner of Strzalkowski U.S. Patent No. 3,035,127, 1 and Auros Electronic Corporation, the owner of Holt U.S. Patent No. 2,999,136 2 and the exclusive licensee of the Strzal-kowski patent, plaintiffs-appellants, brought suit in the District Court charging the defendant-appellee, Beltone Electronics Corporation, with infringement of Claim 13 of the ’127 patent and Claims 1, 2, 7 and 13 of the Holt patent. The defendant counterclaimed for a declaratory judgment that, among other things, both of the patents are invalid and are not infringed by the…