Kennedy v. General Motors Corp.

HAMILTON, Circuit Judge.

The judgment appealed from dismissed plaintiff’s bill for patent infringement on the ground patent No. 1,514,664, issued to him on' November 11, 1924, and which covers a method of making malleable iron, was void for want of invention.

The treatment o'f certain types of cast iron by prolonged heating, generally in oxidizing surroundings, leads to a profound change in the condition of the carbon. The white iron cast for this' purpose is very hard and brittle. However, if “white” iron of suitable composition, which has solidified without separation of graphite, is…