Blake & Knowles Steam Pump Works v. Warren Steam Pump Co.

BROWN, District Judge.

The bill charges infringement of two letters patent; the earlier in.date of application being No. 526,913, granted October 2, 1894, for the invention of Whiting & Wheeler, and No. 522,938, granted July 10, 1894,. for the invention of Hall & Gage. Both patents relate to pumping engines. It clearly appears from the specification of each patent that the devices claimed were intended for use as “air pumps” for withdrawing the water and air from the steam' engine condenser, to maintain a partial vacuum in the condenser and exhaust piping of the engine. The efficiency of the…