A. J. Industries Inc. v. Dayton Steel Foundry Co‪.‬

A. J. Industries, Inc. (herein "plaintiff") brought suit against The Dayton Steel Foundry Company (herein "defendant") for infringement of Ward Patent No. 2,841,414, which plaintiff owned. Defendant denied infringement in its answer and counter-claimed that the patent in suit was invalid. Only two of the twelve claims to the patent, claims 7 and 8, were tried to the District Court which held the claims valid and not infringed. Both parties have appealed from that decision.