US PATENT SUBCLASS 392 / 498
.~.~ With thermostatic control means

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}
498.~.~ With thermostatic control means

DEFINITION

Classification: 392/498

With thermostatic control means:

(under subclass 497) Subject matter wherein the immersion heater includes an electrical control means for controlling

the temperature of the liquid to be heated between predetermined upper and lower limits or at or above predetermined lower limit

SEE OR SEARCH CLASS

119, Animal Husbandry,

73, for watering troughs with liquid temperature control means.

219, Electric Heating,

437, for immersible heating unit; subclasses 510+ for thermally responsive means; and subclass 523 for housing, casing or support insertable into material or space to be heated.

236, Automatic Temperature and Humidity Regulation, appropriate subclass for automatic temperature control systems. 337, Electricity: Electrothermally or Thermally Actuated Switches,

298+, for thermally actuated switches.