Laclede-Christy Company v. Union Fire Brick Company and Harry W. Walters

This appeal is from the judgment of the District Court in a declaratory judgment proceeding that the appellants’ patent 1 was invalid “for lack of invention”. The District Court specifically found as a fact that the principles involved in the patent constituted “an improvement upon checker work then in use in the trade” but that they were the product of mechanical skill and not the product of inventive genius. We have examined the briefs and the record in this case and have carefully considered the arguments of the appellants. We are convinced that the findings of the District Court are amply…