US PATENT SUBCLASS 417 / 259
.~.~ Including valved piston

Current as of: June, 1999
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417 /   HD   PUMPS

244  DF  SUCCESSIVE STAGES {8}
254  DF  .~ Reciprocating rigid stages {8}
259.~.~ Including valved piston {5}
260  DF  .~.~.~> Piston forms or carries inlet and outlet valve for one stage
261  DF  .~.~.~> Serial interstage distributors in piston
262  DF  .~.~.~> Valve in piston is first stage inlet valve
263  DF  .~.~.~> With additional pumping member in parallel flow path
264  DF  .~.~.~> Fluid motor driven

DEFINITION

Classification: 417/259

(under subclass 254) Apparatus in which at least one of the pumping units comprises a valved piston.

(1) Note. For the definition of valved piston see subclass 545 of this class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

256, for pumps including oppositely movable valved pumping members (usually pistons) which successively act on the pump fluid.