Desmond Incandescent Lamp Co. v. General Electric Co.

WOOLLEY, Circuit Judge.

The bill charges infringement of the Just & Hanaman patent No. 1,018,502 and the Langmuir patent No. 1,180,159. The first is for a substantially pure tungsten filament in an incandescent lamp; the second for an incandescent lamp bulb having a tungsten filament enveloped by an atmosphere of inert gas. The case was first here on appeal from a decree of the District Court granting a preliminary injunction. We considered and decided the ease on the assumption of the validity of the patents, many times sustained by other courts, and on issues not whether the patents were…