US PATENT SUBCLASS 417 / 512
.~.~.~ Unitary distributor element controls inlet or discharge for plural chambers

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
510  DF  .~ Mechanically actuated distributor {5}
511  DF  .~.~ Piston carried distributor, one frictionally engages chamber wall, drive rod integral with other (e.g., piston driven by valve element through lost motion connection, etc.) {2}
512.~.~.~ Unitary distributor element controls inlet or discharge for plural chambers

DEFINITION

Classification: 417/512

(under subclass 511) Apparatus in which the valve element comprises a single unitarily movable member which controls either the inlet to or discharge from two or more pump chambers.