US PATENT SUBCLASS 219 / 465.1
.~.~.~ Heating element contacting planar underside of the exposed horizontal planar support surface (e.g., sheet metal, etc.)

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}
443.1  DF  .~.~ Exposed horizontal planar support surface for material to be heated (e.g., hot plate, etc.) {13}
465.1.~.~.~ Heating element contacting planar underside of the exposed horizontal planar support surface (e.g., sheet metal, etc.) {2}
466.1  DF  .~.~.~.~> Foil or film-type of heating element
467.1  DF  .~.~.~.~> Support for the heating element

DEFINITION

Classification: 219/465.1

Heating element contacting planar underside of the exposed

horizontal planar support surface (e.g., sheet metal, etc.):

(under subclass 443.1) Subject matter wherein the means to convert electrical energy into thermal energy is attached to a flat surface underneath the exposed horizontal planar support surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

538+, for a heating unit structure.