Court of Appeals for the Seventh Circuit July 16, 1952, 10584 (Aetna Ball & Roller Bearing Co. v. Standard Unit Parts Corp.)

MAJOR, Chief Judge.

This appeal is from a judgment holding valid and infringed certain claims of three patents, relating to ball bearings, issued to Louis H. Stein, as follows: No. 1,958,725, filed August 14, 1933, issued May 15, 1934; No. 2,140,818, filed November 22, 1937, issued December 20, 1938, and No. 2,230,471, filed October 13, 1938, issued February 4, 1941.