B & S Screw Products Co. v. Cleveland Metal Stamping Co.

CONNELL, Chief Judge.

The plaintiff brought complaint against the defendants on August 9, 1961, alleging that the defendants, by the manufacture and sale of clamping blocks, were infringing United States Patent No. 2,-783,963, which was granted on March 7, 1957 to Glenn Kalberg, plaintiff’s predecessor in interest. On September 1,1961, the defendants, by answer, denied infringement and counterclaimed for a declaration of non-infringement and invalidity of the plaintiff’s patent. The grounds advanced in attacking the validity of the patent were obviousness, lack of patentable novelty, and lack…