US PATENT SUBCLASS 417 / 142
.~.~.~.~ Responsive to pumped fluid pressure

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  DF  .~.~.~ Control by condition of pumped fluid {3}
142.~.~.~.~ Responsive to pumped fluid pressure

DEFINITION

Classification: 417/142

(under subclass 139) Apparatus wherein the mechanism, by which the fluid which is pumped is admitted to or ejected from the pumping chamber, is controlled in response to the pressure of the fluid which is pumped.

(1) Note. This subclass includes those devices which have means which are described as sensing the "weight" of the pumped fluid but which, in fact, sense pumped fluid pressure at a given point in the pump chamber. However, a device which includes a container into which pumped fluid is placed and which measures a predetermined weight of fluid therein to control the pumping operation is classified in subclass 139.

SEE OR SEARCH THIS CLASS, SUBCLASS:

143, for devices wherein repetitive pumping is effected in response to a sensed motive fluid pressure or pressure differential.