U.S. Circuit Court for the Northern District of Illnois January 21, 1895 (De La Vergne Refrigerating Mach. Co. v. Featherstone)

GROSSCUP, District Judge.

The bill in this case is to restrain the infringement of letters patent No. 175,020, issued March 21,1876? to James Boyle, his heirs or assigns, for “an improvement in gas liquefying pumps.” The improvement relates to that class of machinery which is employed for the abstraction of heat for refrigerating and ice-making purposes.