US PATENT SUBCLASS 417 / 7
.~.~.~.~.~ Sequential starting or stopping of pumps

Current as of: June, 1999
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417 /   HD   PUMPS

1  DF  CONDITION RESPONSIVE CONTROL OF PUMP DRIVE MOTOR {22}
2  DF  .~ Plural pumps having separate drive motors, supply sources, or delivery destinations {1}
3  DF  .~.~ Pumps in parallel flow paths with common inflow or outflow {1}
4  DF  .~.~.~ Having means sensing condition in common inflow or outflow line {1}
5  DF  .~.~.~.~ With control of plural pump drive motors {2}
7.~.~.~.~.~ Sequential starting or stopping of pumps {1}
8  DF  .~.~.~.~.~.~> Alternating sequences

DEFINITION

Classification: 417/7

(under subclass 5) Subject matter in which the control means

for the pumps comprise a start and stop device for the motor of each pump and which are related to one another in such a manner that the pumps will either be started or stopped in a certain order in response to changes in conditions sensed by the sensing means.