Simplex Piston Ring Co. of America, Inc. v. Hamilton

CAMPBELL, District Judge.

This is a suit in equity to obtain relief by injunction and to r.eeover damages for the alleged infringement by the defendant of United States letters patent No. 1,601,575, issued to Lewis C. Marshall, assignor by mesne assignments to the Simplex Piston Ring Company of America, for piston packing,, dated September 28, 1926.

The defendant is doing business in this district under the name and style, of Hamilton Motor Parts Company. The defense was taken over and paid for by the-Joe Jackson Motor Parts Company, of Philadelphia,'Pa. The defenses are invalidity and…