Key Boiler Equipment Co. v. Coleman

BINGHAM, Circuit Judge.

This is a suit in equity brought by the Key Boiler Equipment Company against Albert M. Coleman for infringement of United States letters patent No. 1,391,738, issued September 27, 1921, to Frederick E. Key, and now owned by the plaintiff, for a sealing paste. The defenses are invalidity, anticipation, and noninfringement. In the District Court the patent was found to be valid and not infringed. A decree was entered dismissing the bill, and the plaintiff appealed.

In the application for the patent, the applicant sought the allowance of nine claims. In the Patent Office…