US PATENT SUBCLASS 417 / 297
.~ Expansible chamber pump distributor operation modified

Current as of: June, 1999
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417 /   HD   PUMPS

279  DF  WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
297.~ Expansible chamber pump distributor operation modified {2}
297.5  DF  .~.~> Liquid level responsive
298  DF  .~.~> Inlet valve

DEFINITION

Classification: 417/297

(under subclass 279) Apparatus in which the fluid flow control means includes a cyclically operable pump valve and means for modifying the normal operation of said valve.