US PATENT SUBCLASS 417 / 52
EXPANSION AND CONTRACTION OF PUMP FLUID


Current as of: June, 1999
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417 /   HD   PUMPS

52EXPANSION AND CONTRACTION OF PUMP FLUID


DEFINITION

Classification: 417/52

(under the class definition) Subject matter in which the fluid to be pumped is isolated in a chamber, heated to expel a portion thereof from the chamber, this expelled portion constituting the pumped fluid, and the fluid remaining in the chamber then cooled so as to contract and establish a reduced pressure in the chamber to draw in a new charge of fluid.