US PATENT SUBCLASS 392 / 341
.~.~ For fluid heating (e.g., gas or liquid, etc.)

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

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
339  DF  .~ With heat storage means {7}
341.~.~ For fluid heating (e.g., gas or liquid, etc.)

DEFINITION

Classification: 392/341

For fluid heating (e.g., gas or liquid, etc.):

(under subclass 339) Subject matter wherein the heat storage means is used for heating a liquid or gas.

SEE OR SEARCH THIS CLASS, SUBCLASS:

379, for concentrated heated air stream.

441+, for tank or container type liquid heater.

465+, for continuous fluid heater (not in stored medium).

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Solids, appropriate subclasses for apparatus employing heated gas. 122, Liquid Heaters and Vaporizers,

35, for liquid heaters and vaporizers having accumulator.

126, Stoves and Furnaces,

400, and 617+ for heat storage mass of solar heat collector.

134, Cleaning and Liquid Contact With Solids,

105, for devices with heating, cooling or exchange means.

137, Fluid Handling,

301, for hydrants with protection against freezing which may be a heater and subclasses 334+ for systems with heating or cooling.

138, Pipes and Tubular Conduits,

32, 35 for thawing and freeze protection.

159, Concentrating Evaporators, appropriate subclasses for heating fluids.

165, Heat Exchange, appropriate subclasses for heating fluids. 166, Wells,

57, 62 for heating or heat insulating means.

196, Mineral Oils: Apparatus,

104+, for vaporizing devices and subclasses 138+ for condensing devices utilizing heating means.

202, Distillation: Apparatus,

81+, for apparatus utilizing heating means.

210, Liquid Purification or Separation,

175+, for systems employing heater or heat exchanger means.