US PATENT SUBCLASS 392 / 502
.~.~ Having positive temperature coefficient


Current as of: June, 1999
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392 /   HD   ELECTRIC RESISTANCE HEATING DEVICES

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
497  DF  .~ Immersion heater details {6}
502.~.~ Having positive temperature coefficient


DEFINITION

Classification: 392/502

Having positive temperature coefficient:

(under subclass 497) Subject matter wherein the resistance heating element of the immersion heater increases its resistance as the temperature increases.

SEE OR SEARCH CLASS

219, Electric Heating,

504+, for variable resistance means and subclasses 552+ for heating element structure.

338, Electrical Resistors,

22+, for thermistor type and subclasses 25+ for ambient temperature.

374, Thermal Measuring and Testing, 183+, for current modifying sensor and, particularly, subclass 185 for detail of resistive sensor.