US PATENT SUBCLASS 417 / 444
.~.~ Distributor in piston

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
443  DF  .~ Pressure responsive distributor opened responsive to pumping member position {1}
444.~.~ Distributor in piston {1}
445  DF  .~.~.~> Including means to open distributor in fixed chamber wall

DEFINITION

Classification: 417/444

(under subclass 443) Apparatus in which the pressure responsive distributor which is moved to open position is located on or carried by a piston-type pumping member (includes diaphragm-type pumping member).