Thomson-Houston Electric Co. v. Lorain Steel Co.

WALLACE, Circuit Judge.

This is an appeal from a decree adjudging the validity, and infringement by the defendant, of claims 1, 2, B, and 4 of letters patent Ho. 428,169, dated May 20, 1890, issued to Walter II. .Knight, for an “electro-motor regulator.”

Tlie patent relates to the controller apparatus of motors used on electric railway cars and working on a circuit of constant potential, in which the regulator governing the speed and the reverser governing the direction of the car are operated by the manipulation of the motorman. In such apparatus the office of the regulator is to introduce…