US PATENT SUBCLASS 219 / 463.1
.~.~.~ Formed by tubularly shaped heating unit

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}
463.1.~.~.~ Formed by tubularly shaped heating unit {1}
464.1  DF  .~.~.~.~> Having plural tubular heating units

DEFINITION

Classification: 219/463.1

Formed by tubularly shaped heating unit:

(under subclass 443.1) Subject matter wherein the exposed horizontal planar support surface is constructed by means supporting a heating element in an operative position and fashioned into a tube-like configuration.

SEE OR SEARCH THIS CLASS, SUBCLASS:

544, for a heating unit structure with resistive-element embedded within or completely surrounded by core, sheath, or support means.

546+, for a heating unit structure having a core, sheath, or support means for the heating element.

SEE OR SEARCH CLASS

338, Electrical Resistors,

226+, for an encased, embedded, or housed electrical resistor.