US PATENT SUBCLASS 338 / 23
.~.~.~ Indirectly heated

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

13  DF  RESISTANCE VALUE RESPONSIVE TO A CONDITION {10}
20  DF  .~ Current and/or voltage (e.g., ballast resistor) {3}
22 R  DF  .~.~ Thermistor type {2}
23.~.~.~ Indirectly heated

DEFINITION

Classification: 338/23

(under subclass 22) Subject matter wherein a resistance heater for the thermistor is provided other than the thermistor resistance and in a current circuit distinct from the current circuit through the thermistor.

(1) Note. The heater circuit may be in series or shunt with the thermistor, or be in another electrical system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

24, for resistors generally whose resistance value changes in response to a current which indirectly heats the resistance element.

SEE OR SEARCH CLASS

219, Electric Heating,

50+, for electrical resistance heaters.