US PATENT SUBCLASS 417 / 144
.~.~.~ Correlated motive fluid valve and pressure or vacuum generating means

Current as of: June, 1999
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417 /   HD   PUMPS

65  DF  ONE FLUID PUMPED BY CONTACT OR ENTRAINMENT WITH ANOTHER {10}
118  DF  .~ Liquid pumped by supplying or exhausting gaseous motive fluid to or from pumping chamber {7}
137  DF  .~.~ Cyclic pumping {5}
144.~.~.~ Correlated motive fluid valve and pressure or vacuum generating means

DEFINITION

Classification: 417/144

(under subclass 137) Apparatus in which said means for effecting the admission and ejection of the pumped fluid from the pump chamber is a valve means for supplying or exhausting the gaseous pumping fluid to said chamber and having additional means correlating control of said valve means with the operation of a means generating said motive fluid.