US PATENT SUBCLASS 392 / 456
.~.~.~.~ 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}
441  DF  .~ Tank or container type liquid heater {4}
449  DF  .~.~ Line connected tank {4}
451  DF  .~.~.~ With immersion heating element {6}
456.~.~.~.~ With heat exchange fluid

DEFINITION

Classification: 392/456

With heat exchange fluid:

(under subclass 451) Subject matter wherein the tank includes a fluid which is heated by the heating element for subsequent transmission of the heat to the liquid to be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

302, for heat exchange fluid used in borehole.

357, for convection space heater using heat exchange fluid.

496, for continuous fluid heater using heat exchange fluid.

SEE OR SEARCH CLASS

126, Stoves and Furnaces, 376+, for fluid heated vessels.

165, Heat Exchange,

104.11, for intermediate fluent heat exchange material receiving and discharging heat.

239, Fluid Sprinkling, Spraying, and Diffusing,

139+, for spaced jacket or compartment for heating fluid.

252, Compositions,

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

338, Electrical Resistors,

231, for incased, embedded, or housed resistors in liquid.