US PATENT SUBCLASS 417 / 550
.~.~ Flexible


Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
545  DF  .~ Valved piston {7}
550.~.~ Flexible


DEFINITION

Classification: 417/550

(under subclass 545) Apparatus in which the valve or part thereof (e.g., hinge) is formed of flexible material and in which opening and closing of said valve is effected by the flexing of said material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

479, for a flexible wall-type pumping member in which a portion of said flexible wall forms a pump fluid valve.