US PATENT SUBCLASS 417 / 137
.~.~ Cyclic pumping

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.~.~ Cyclic pumping {5}
138  DF  .~.~.~> Control by liquid level sensing means
139  DF  .~.~.~> Control by condition of pumped fluid {3}
143  DF  .~.~.~> Motive fluid supply or exhaust valve responsive to motive fluid pressure
144  DF  .~.~.~> Correlated motive fluid valve and pressure or vacuum generating means
145  DF  .~.~.~> Correlated supply - exhaust of motive fluid or vacuum generating means {2}

DEFINITION

Classification: 417/137

(under subclass 118) Apparatus wherein the pumping chamber alternately admits and ejects a fluid which is pumped by controlling flow of the pumped fluid or motive fluid by a mechanism motivated (1) in response to an ambient or external pumped fluid or motive fluid condition or (2) by the pumped fluid, motive fluid or other means.