US PATENT SUBCLASS 417 / 552
.~.~ Reciprocating

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
545  DF  .~ Valved piston {7}
552.~.~ Reciprocating {2}
553  DF  .~.~.~> Annular
554  DF  .~.~.~> Ball type

DEFINITION

Classification: 417/552

(under subclass 545) Apparatus in which the valve comprises a member movable in a to-and-fro motion toward and away from its seat.

SEE OR SEARCH CLASS

137, Fluid Handling,

528+, for a reciprocating direct responsive valve.