US PATENT SUBCLASS 417 / 289
.~ Variable cutoff or pumping member controlled port

Current as of: June, 1999
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417 /   HD   PUMPS

279  DF  WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
289.~ Variable cutoff or pumping member controlled port

DEFINITION

Classification: 417/289

(under subclass 279) Apparatus in which the pump includes an expansible chamber-type pump having a supply or discharge port controlled by the position of the pumping member and the position at which the pumping member covers or uncovers the port is varied in response to the sensed condition.

(1) Note. For the purpose of this definition a pumping member controlled port includes the types set forth below in subclass 490.