Harris Calorific Co. v. Marra

THOMPSON, Circuit Judge.

These are cross-appeals from decrees of the District Court for the Western District of Pennsylvania. The plaintiff is the owner by assignment of six patents, Harris patents, 1,571,004, 1,568,331, 1,547,388, and Campbell patents, 1,751,447, 1,835,845, and 1,920,965, all relating to improvements in blowpipes employed in welding and cutting metals. The plaintiff filed three bills of complaint, charging defendant with direct infringement of Harris patent, 1,568,331, and contributory infringement of all, six patents, as well as unfair trade practices. The cases were…