Court of Appeals for the Sixth Circuit August 7, 1970, 19786 (Panduit Corporation v. Stahlin Bros. Fibre Works, Inc.)

CELEBREZZE, Circuit Judge.

This is an appeal from an order of the United States District Court for the Western District of Michigan, Southern Division, holding a patent on an electrical wiring duct owned by the Panduit Corporation, U. S. Patent No. 3,024,301, issued on March 6, 1962 to K. R. Walch [hereinafter the “Walch” patent], valid and infringed by two devices manufactured by Stahlin Bros.