Lees-Bradner Co. v. National Tool Co.

DENISON, Circuit Judge.

This infringement suit is based upon two patents, relating to machines for grinding gear teeth by generating the appropriate involute curve thereon. The patents in suit are Lees, 1,390,145, September 6, 1921, and Schurr, 1,462,985, July 24, 1925. The District Court held each patent invalid for want of invention.

In each patent the device comprises a longitudinally reciprocating table, a rotatable gear-holding spindle mounted thereon, and intermediate translating devices wher-eby the intermittent reciprocating revolution of the spindle causes the reciprocating…