US PATENT SUBCLASS 417 / 44.8
.~.~.~ Piston-type sensor


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}
44.2  DF  .~.~ Responsive to pump fluid pressure {7}
44.8.~.~.~ Piston-type sensor


DEFINITION

Classification: 417/44.8

Piston-type sensor:

(under subclass 44.2) Apparatus wherein the motor comprises an electrical circuit and the sensing means includes a plunger or a solid disk which fits snugly into a cylinder and wherein the plunger or the disk moves when subjected to the fluid pressure variation in the cylinder causing the electrical circuit of the motor to close or open.