US PATENT SUBCLASS 417 / 385
.~.~.~.~ With means to supply or vent pulsator fluid

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
375  DF  .~ Fluid motor {9}
379  DF  .~.~ With motive fluid generator {5}
383  DF  .~.~.~ Pulsator or fluid link {3}
385.~.~.~.~ With means to supply or vent pulsator fluid {3}
386  DF  .~.~.~.~.~> Working member position responsive
387  DF  .~.~.~.~.~> Pulse piston position responsive
388  DF  .~.~.~.~.~> Pressure responsive

DEFINITION

Classification: 417/385

(under subclass 383) Apparatus in which means is provided to supply additional fluid to or exhaust fluid from the fluid

confining chamber.

(1) Note. Means for merely prefilling the chamber with fluid prior to operation of the device or means for emptying the chamber during inactivity are not included under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

378, for pulsator devices in which the pumped fluid flows serially through the pulsator fluid containing chamber. Such devices necessarily include means for allowing fluid flow to and from the pulsator chamber and have not been cross-referenced into this subclass or those indented hereunder.

SEE OR SEARCH CLASS

60, Power Plants, 543, for a self-cycling pulsator, per se, or driving a merely nominal load that has self-operated pulse fluid purge and quantity adjusting structure.