US PATENT SUBCLASS 417 / 528
.~.~.~ Fluid conduit for one chamber extends through portion of another

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}
528.~.~.~ Fluid conduit for one chamber extends through portion of another

DEFINITION

Classification: 417/528

(under subclass 523) Apparatus in which the chambers are positioned in axial alignment and a conduit for conducting fluid to or from a first pumping chamber extends axially through a portion of a second pumping chamber.

SEE OR SEARCH THIS CLASS, SUBCLASS:

526, and 527, for axially aligned pumping chambers and a common pumping member having valves for both chambers and a pump fluid conduit extending through one of the chambers.