US PATENT SUBCLASS 417 / 526
.~.~.~.~ Common inlet or discharge conduit mounted on piston

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521  DF  .~ Plural pumping chambers {7}
523  DF  .~.~ Including valved piston {5}
525  DF  .~.~.~ Common piston includes valves for plural axially aligned chambers {2}
526.~.~.~.~ Common inlet or discharge conduit mounted on piston

DEFINITION

Classification: 417/526

(under subclass 525) Apparatus in which there is a single inlet or discharge conduit common to the plural chambers said conduit being mounted on and movable with the piston.