US PATENT SUBCLASS 417 / 275
.~ Valved clearance chamber

Current as of: June, 1999
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417 /   HD   PUMPS

274  DF  CONDITION RESPONSIVE VARIABLE VOLUMETRIC CAPACITY EXPANSIBLE CHAMBER PUMP (I.E., CLEARANCE CONTROL) {1}
275.~ Valved clearance chamber {2}
276  DF  .~.~> Connectable clearance chambers of opposed pump chambers
277  DF  .~.~> Plural chambers connected to single pump chamber

DEFINITION

Classification: 417/275

(under subclass 274) Apparatus in which the means to vary the clearance volume comprises a separate chamber for varying the capacity of the expansible chamber, and a valve means for isolating said separate chamber from the expansible chamber.

(1) Note. For the definition of an expansible chamber-type pump, see definition of subclass 437 below.