US PATENT SUBCLASS 417 / 498
.~.~ Longitudinally spaced inlet and discharge sidewall ports


Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
490  DF  .~ Pumping member position controlled port {8}
498.~.~ Longitudinally spaced inlet and discharge sidewall ports


DEFINITION

Classification: 417/498

(under subclass 490) Apparatus comprising one port for providing inlet of pump fluid to the pump chamber and another port for providing discharge of pump fluid therefrom, each of said ports being formed in a pump chamber sidewall portion and longitudinally spaced from each other, said ports

individually providing the sole path for inlet and discharge of pump fluid and being controlled by the covering or uncovering thereof by the pumping member or element carried thereby.