US PATENT SUBCLASS 417 / 272
.~ Continuous unidirectional fluid bias on reciprocating member

Current as of: June, 1999
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417 /   HD   PUMPS

269  DF  THREE OR MORE CYLINDERS ARRANGED IN PARALLEL, RADIAL, OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {4}
272.~ Continuous unidirectional fluid bias on reciprocating member

DEFINITION

Classification: 417/272

(under subclass 269) Apparatus in which there is provided fluid pressure responsive means located externally of the pumping chambers and associated with at least one of said plural cylinders or relatively reciprocating piston for exerting thereon a continuous force in one reciprocatory

stroke direction to promote expansion or contraction of the pumping chamber associated with said one cylinder or piston.