US PATENT SUBCLASS 417 / 145
.~.~.~ Correlated supply - exhaust of motive fluid 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}
145.~.~.~ Correlated supply - exhaust of motive fluid or vacuum generating means {2}
146  DF  .~.~.~.~> With pilot valve
147  DF  .~.~.~.~> Unitary supply - exhaust valve

DEFINITION

Classification: 417/145

(under subclass 137) Apparatus wherein said means for effecting the admission and ejection of the pumped fluid from the pump chamber comprises valve means which correlates the supplying and exhausting of motive fluid to and from the pumping chamber.