US PATENT SUBCLASS 417 / 44.5
.~.~.~ Mercury switch

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
44.2  DF  .~.~ Responsive to pump fluid pressure {7}
44.5.~.~.~ Mercury switch

DEFINITION

Classification: 417/44.5

Mercury switch:

(under subclass 44.2) Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a device which contains mercury which is motivated by the variations in the fluid pressure; the said motivation triggers the electrical circuit of the motor to close or open.