US PATENT SUBCLASS 417 / 139
.~.~.~ Control by condition of pumped fluid

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}
139.~.~.~ Control by condition of pumped fluid {3}
140  DF  .~.~.~.~> Movable pumping chamber
141  DF  .~.~.~.~> Responsive to flow of pumped fluid
142  DF  .~.~.~.~> Responsive to pumped fluid pressure

DEFINITION

Classification: 417/139

(under subclass 137) Apparatus wherein the mechanism, by which the fluid which is pumped is admitted to or ejected from the pump chamber, is motivated in response to a condition of the pumped fluid.