Enterprise Railway Equipment Company, an Illinois Corporation v. Keystone Railway Equipment Company, an Illinois Corporation

SCHNACKENBERG, Circuit Judge.

This is a patent infringement action. Plaintiff, Enterprise Railway Equipment Company, charged defendant, Keystone Railway Equipment Company, both Illinois corporations, with infringement of Dorey U. S. patent No. 2,791,973. Defendant denied infringement and set up a defense of invalidity of the patent. The district court held the patent valid and infringed, and entered a judgment, findings of fact and conclusions of law. Defendant has appealed.

The patent in suit is entitled “Operating Mechanism For Sliding Gate For A Discharge Outlet Mounted On A Load Containing…