US PATENT SUBCLASS 222 / 253
.~.~ With material-operated differential piston

Current as of: June, 1999
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222 /   HD   DISPENSING

251  DF  WITH DISCHARGE ASSISTANT (E.G., IMPELLER, PUMP, CONVEYER, MOVABLE TRAP CHAMBER, ETC.) {30}
252  DF  .~ Plural {9}
253.~.~ With material-operated differential piston

DEFINITION

Classification: 222/253

(under subclass 252) Dispensers having two forcing devices, a quantity being fed by one device at one pressure, the second forcing device taking a part of such quantity and delivering it under higher pressure to the point of use by energy derived from the said quantity.

SEE OR SEARCH CLASS

417, Pumps,

225+, for pumps in which a quantity of fluid at one head is divided with the head of one portion being utilized to increase the head of the other.