Ruben Condenser Co. v. Aerovox Corporation

L. HAND, Circuit Judge.

The plaintiffs sued the defendant in Brooklyn upon patent No. 1,891,207; the defendant counterclaimed upon two patents, Nos. 1,815,768 and 1,789,949. The judge passed a decree holding the plaintiffs’ patent valid and infringed and dismissing the counterclaim. The defendant appealed. We need discuss only the plaintiffs’ patent, because we dispose of the counterclaim on other grounds. All the patents are for improvements in dry electrolytic condensers; the defendant’s are the same as those concerned in a suit brought by it against the Concourse Electric Company and…