Trico Products Corp. v. E. A. Laboratories, Inc.

MANTON, Circuit Judge.

This appeal is a test of the infringement of patents No. 1,434,655 (claims 1, 2; 3; 4) and No. 1,391,887 (claim 4), held not to be *678infringed by appellee’s manufactured horn in the court below. The patents are for suction operated automobile horns. They provide for a horn having a chamber with an opening therethrough and connecting with a horn bell, a valve for opening and closing the opening, and a valve or air withdrawal port of smaller size than the opening, to which the suction is applied. A resilient means tends to maintain the valve on its seat and resists…