Robinson v. Chicago City Ry. Co.

In the suit below, the appellant alleged infringement of letters patent No. 594,286, issued to himself November 23, *4391897, and relating to a mechanical combination process for the casting of composite or other wheels. The object of the invention is to make a composite wheel with the outer portions or sides of one metal and the inner portions of another, and, in the case of pulleys, to give to the center of the groove of the pulley a hard or chilled surface, while leaving the balance of the metal soft. The letters patent contain ten claims, but it is apparent, from an examination of the…