Stewart-Warner Corporation, Cross-Appellee v. The City of Pontiac, Michigan, and American Sign & Indicator Corporation, Cross-Appellants

MERRITT, Circuit Judge.

Plaintiff appeals from the District Court’s judgment granting defendants’ motion for directed verdict in this infringement suit involving two patents for large stadium scoreboards with matrices of light bulbs displaying moving images. The essential holding of the District Court was that the plaintiff lost its patent monopoly over the two inventions because it put the invention on the market more than a year before its two patent applications were filed. We agree with the District Court as to the first patent but disagree as to the second.

Stewart-Warner Corporation sued…