US PATENT SUBCLASS 417 / 431
.~ By application of separate fluid

Current as of: June, 1999
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417 /   HD   PUMPS

430  DF  INCLUDING MEANS TO (1) AGITATE PUMP FLUID, OR (2) PREVENT FOREIGN MATERIAL SETTLING FROM PUMP FLUID {1}
431.~ By application of separate fluid

DEFINITION

Classification: 417/431

(under subclass 430) Apparatus in which said means comprises a fluid other than the pump fluid which is applied to or injected into the pump fluid.

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432+, for means to apply a separate fluid to a pump valve.