US PATENT SUBCLASS 340 / 622
.~.~.~.~.~ Having heat sensor

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}
603  DF  .~.~ Fluent material {7}
612  DF  .~.~.~ Material level {6}
618  DF  .~.~.~.~ Liquid {5}
622.~.~.~.~.~ Having heat sensor

DEFINITION

Classification: 340/622

Having heat sensor:

(under subclass 618) Subject matter wherein the liquid level is detected by a thermally responsive sensor.

SEE OR SEARCH CLASS

122, Liquid Heaters and Vaporizers,

504.2, for boiler alarm or indicator thermally responsive to steam when water level falls below a certain limit.