US PATENT SUBCLASS 392 / 302
.~.~ 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}
301  DF  .~ Borehole type {5}
302.~.~ With heat exchange fluid

DEFINITION

Classification: 392/302

With heat exchange fluid:

(under subclass 301) Subject matter wherein the heating device comprises a fluid which is heated by the heating element, and the heated fluid conveys its heat to the well or bore.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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 material receiving and discharging heat.