US PATENT SUBCLASS 417 / 12
.~ Having timer or delay means


Current as of: June, 1999
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417 /   HD   PUMPS

1  DF  CONDITION RESPONSIVE CONTROL OF PUMP DRIVE MOTOR {22}
12.~ Having timer or delay means


DEFINITION

Classification: 417/12

(under subclass 1) Subject matter having means related to the sensing means for either (1) causing the state of operation of the drive motor to be maintained for a specified period of time after a condition or change in condition is detected by the sensing means before allowing the state of operation to be changed in accordance with the sensed condition, (2) allowing the state of operation of the drive motor to be changed in response to a sensed condition and then causing said changed state of operation to be maintained for a specified period of time regardless of further condition changes, (3) causing the control means or sensing means to be ineffective for a specified period of time during motor start up, or (4) altering the effectiveness of the control means for a specified period of time after the sensing means has detected a change in condition.

(1) Note. A fluid dashpot or damper utilizing fluid independent of the pump fluid and which serves only to attenuate the effect of periodic condition fluctuations of short duration is not considered to be a delay or timing means under this definition.