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 of 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...
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