US PATENT SUBCLASS 219 / 520
.~ With heater-unit housing, casing, or support means (e.g., frame and single sheet)

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

200  DF  HEATING DEVICES {14}
520.~ With heater-unit housing, casing, or support means (e.g., frame and single sheet) {13}
521  DF  .~.~> Including or comprising holding or support means for material to be heated
522  DF  .~.~> Housing, casing, or support performs plural diverse functions (e.g., window)
523  DF  .~.~> Housing, casing, or support insertable into material or space to be heated (e.g., immersion type)
524  DF  .~.~> Comprising hinged or separable compartment (e.g., waffle iron type) {1}
526  DF  .~.~> With means for attaching housing or casing to an external device (e.g., magnetic or vacuum) {1}
528  DF  .~.~> Flexible or resilient (e.g., warming pad) {1}
530  DF  .~.~> With heat storage or transfer means (vanes)
531  DF  .~.~> With thermal insulation or cooling means
532  DF  .~.~> With open frame or grid-type support
533  DF  .~.~> Portable (e.g., with handle)
534  DF  .~.~> Rigid tubular housing, casing, or support (e.g., flattened tube)
535  DF  .~.~> Specially formed or adapted to fit material to be heated (e.g., a pipe)
536  DF  .~.~> With heating unit mounting or attaching means {1}

DEFINITION

Classification: 219/520

(under subclass 200) Subject matter comprising the combination of a resistance heater unit with a particular housing, casing or support means therefor.

(1) Note. In order to be classified here the heating unit and housing, casing or support must comprise an operative whole independent of any art device with which it may be used. The heating unit may or may not be permanently attached to the housing or casing as long as the two are specifically adapted for use only with each other. Either the heating unit or the housing may be adapted for diverse use aside from its primary purpose, for example the heating unit

may be embedded in a glass or plastic which serves also as a windshield as long as the claimed subject matter does not comprise details of the windshield which makes the device primarily a part of a vehicle.

SEE OR SEARCH THIS CLASS, SUBCLASS:

385+, for the combination of at least one heating device or unit with a container, enclosure or support means for the material to be heated.

SEE OR SEARCH CLASS

338, Electrical Resistors, 226+, for resistor means, per se, which is incased, embedded or housed and subclasses 315+ for electrical resistors, per se, combined with mounting or support means.