US PATENT SUBCLASS 340 / 643
.~.~.~.~ Thermal or magnetic current sensors

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
635  DF  .~.~ Condition of electrical apparatus {15}
641  DF  .~.~.~ Signalling light element {2}
643.~.~.~.~ Thermal or magnetic current sensors

DEFINITION

Classification: 340/643

Thermal or magnetic current sensors:

(under subclass 641) Subject matter where the condition of the light is sensed by means responsive to the thermal or magnetic effects of current flow through a conductor connected to the light being monitored.