US PATENT SUBCLASS 417 / 44.11
.~.~ Responsive to change in electrical operating characteristic

Current as of: June, 1999
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417 /   HD   PUMPS

1  DF  CONDITION RESPONSIVE CONTROL OF PUMP DRIVE MOTOR {22}
44.1  DF  .~ By control of electric or magnetic drive motor {3}
44.11.~.~ Responsive to change in electrical operating characteristic

DEFINITION

Classification: 417/44.11

Responsive to change in electrical operating characteristic:

(under subclass 44.1) Apparatus wherein the electric drive motor comprises a sensing means where an operating characteristic changes in response to a change in an electrical current drawn by the motor or a change in a voltage across the motor or a change in a phase shift of the motor.