US PATENT SUBCLASS 219 / 395
.~.~.~ With plurality of separate heating units

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

200  DF  HEATING DEVICES {14}
385  DF  .~ Combined with container, enclosure, or support for material to be heated {12}
391  DF  .~.~ Oven type {12}
395.~.~.~ With plurality of separate heating units {3}
396  DF  .~.~.~.~> Of diverse construction or functioning in diverse manners
397  DF  .~.~.~.~> Of different resistive values
398  DF  .~.~.~.~> Selectively energized

DEFINITION

Classification: 219/395

(under subclass 391) Subject matter wherein the heating device structure includes at least two or more separate and distinct heating units.

SEE OR SEARCH THIS CLASS, SUBCLASS:

417, for deep well heaters with plural separate heating units.

422, for crucible or furnace structures with plural separate heating units.

462.1, for an exposed horizontal planar support surface for material to be heated (e.g., hot plate, etc.) having plural heating elements gapped from underside of the exposed horizontal support surface (e.g., ceramic plate, radiation type, etc.).

464.1, for an exposed horizontal planar support surface for

material to be heated (e.g., hot plate, etc.) having plural tubular heating units. 470, for cylindrical or roller support structures with plural heating units.

539, below for significant heating unit structure comprising plural resistive elements, subclass 478 for plural heating devices under the class definition combined with a single housing support or casing for the heaters, and subclasses 483+ for significant power supply, voltage or current regulation or control means combined with plural separate and distinct resistance elements.