Imperial Machine & Foundry Corp. v. United States

This case involves the questions of the validity and infringement of plaintiff’s patent No. 809582, and is ruled *506by the case of Imperial Machine & Foundry Corporation v. United States, No. C-320, this day decided, ante, p. 491.

The owners of this patent have found it necessary to litigate and relitigate their rights in the courts, and the plaintiff and its predecessors from the year 1906 to the fall of 1923 prepared and sent circulars to persons, firms, and corporations, makers of the “ Economical ” machine, hereinafter referred to, warning them not to infringe the plaintiff’s patent or to buy…