US PATENT SUBCLASS 417 / 458
.~.~ Plural pressure responsive distributors

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
456  DF  .~ Relatively movable serial distributors {2}
458.~.~ Plural pressure responsive distributors {1}
459  DF  .~.~.~> Located within piston (e.g., valved piston)

DEFINITION

Classification: 417/458

(under subclass 456) Apparatus in which said two or more serially arranged distributors are of the type which move to an open or closed position in response to a pressure differential in the pumping chamber and the inlet or discharge conduit.