Heyman Manufacturing Co. v. Hap Corp.

DAY, District Judge.

In this suit, as originally filed, plaintiff alleged infringement by the defendant of plaintiff’s patent No. 2,476,738, issued July 19,1949, to plaintiff as assignee of Ferdinand Klumpp, Jr. for the construction of a solderless blade for electrical plug caps. In its answer setting up the defenses of invalidity and non-infringement the defendant included a counterclaim alleging that plaintiff had infringed the claims of four letters patent belonging to it as the assignee of William P. Herman. These patents are (1) No. 2,191,384, issued February 20, 1940 for the construction…