US PATENT SUBCLASS 392 / 447
.~.~.~ With internally positioned heating element

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}
444  DF  .~.~ Portable container or tank {3}
447.~.~.~ With internally positioned heating element {1}
448  DF  .~.~.~.~> Removably inserted through fill opening

DEFINITION

Classification: 392/447

With internally positioned heating element:

(under subclass 444) Subject matter wherein the heating device for heating the liquid in the tank or container is placed in a portion of the tank or container receiving the liquid to be heated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

333+, for manually filled tank or container.

403+, for container with self-contained evaporant supply.

497+, for immersion heater details.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

344+, for water heaters. 219, Electric Heating,

437, for immersible and subclass 523 for housing, casing or support insertable into material or space to be heated.

222, Dispensing,

146.1, for heating or cooling means.