Kant-Skore Piston Co. v. Sinclair Mfg. Corporation

MACK, Circuit Judge.

Suit for specific performance of a patent licensing agreement.

Patent No. 1325176 was granted December 16, 1919, to A. A. Spillman for an improvement in internal combustion engines. The object of the invention was to make practicable the substitution of aluminum for cast iron in pistons because of the substantial advantages in weight. This had theretofore been impracticable due to the fact that aluminum pistons expand under the heat of operation twice as rapidly as the east-iron engine cylinders containing them and thus tend to score the walls thereof. Spillman cut through…