US PATENT SUBCLASS 219 / 538
.~ With heating unit structure

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
538.~ With heating unit structure {6}
539  DF  .~.~> Comprising plural separate and distinct resistive elements
540  DF  .~.~> With heat storage or transfer means (e.g., fins or plate)
541  DF  .~.~> With terminal or connector means (e.g., to external circuit means)
542  DF  .~.~> With resistive-element attaching, securing or electrical insulation means {3}
546  DF  .~.~> Core, sheath, or support means for heating element {2}
552  DF  .~.~> Heating element structure {1}

DEFINITION

Classification: 219/538

(under subclass 200) Subject matter consisting of a heating element, usually resistive, with a core, sheath or support means, the combination comprising a basic heating unit adapted to form a subcombination of a more comprehensive combination which is classifiable higher up in this class or in another art class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

119+, for metal heating resistance welding electrodes.

145.1+, and 146.1+, for metal heating arc welding electrodes.

221+, for specific heating unit means combined with a hand tool.

254+, for a specific heating unit combined with an electric iron.

270, for a specific igniter unit. 275, for specific heating unit means combined with a vaporizer.

278, for a specific heating unit combined with an oil well heater.

335+, for a specific heating unit combined with a liquid heater.

353, for a specific heating unit combined with a radiant heater.

385, for a specific heating unit combined with a convection heater.

414+, for a specific heating unit combined with an over type enclosure.

431+, for significant heating unit means combined with a

crucible or furnace.

469+, for significant heating unit means combined with a hot plate.

520+, for the combination of a heater unit with a particular housing or casing therefor in general.

600+, for induction heating system and subsystem.

678+, for microwave heating system and subsystem. 764+, for capacitive dielectric heating system and subsystem.