US PATENT SUBCLASS 392 / 377
.~.~.~ With heat exchange fluid

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
347  DF  .~ Convection space heater {10}
375  DF  .~.~ Combined with radiation {2}
377.~.~.~ With heat exchange fluid {1}
378  DF  .~.~.~.~> In plural sections

DEFINITION

Classification: 392/377

With heat exchange fluid:

(under subclass 375) Subject matter including a fluid which is heated by the resistance heating element for subsequent transmission to the space to be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

344, for convection space heating in heat storage.

357, for intermediate heat absorber.

456, for heat exchange fluid line connected heated storage tank.

496, for continuous fluid heater.

SEE OR SEARCH CLASS

165, Heat Exchange, 104.11+, for intermediate fluent heat exchange.

236, Automatic Temperature and Humidity Regulation,

36+, for heating radiators.

237, Heating Systems,

16+, for combined radiator and boiler and subclasses 70+ for heat radiators.

252, Compositions,

67, for vaporization, or expansion, refrigeration or heat or energy exchange.