US PATENT SUBCLASS 417 / 8
.~.~.~.~.~.~ Alternating sequences


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  DF  .~.~.~.~.~ Sequential starting or stopping of pumps {1}
8.~.~.~.~.~.~ Alternating sequences


DEFINITION

Classification: 417/8

(under subclass 7) Subject matter having means related to the control means for cyclically changing the order of starting or stopping the pump drive motors.