US PATENT SUBCLASS 392 / 307
.~ Combined with nonelectric heating means (e.g., gas, etc.)

Current as of: June, 1999
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392 /   HD   ELECTRIC RESISTANCE HEATING DEVICES

*  DD  HEATING DEVICES (CLASS 219 SUBCLASS 200) {11}
307.~ Combined with nonelectric heating means (e.g., gas, etc.) {3}
308  DF  .~.~> For heating liquid
309  DF  .~.~> Hot plate
310  DF  .~.~> Oven type

DEFINITION

Classification: 392/307

Combined with nonelectric heating means (e.g., gas, etc.):

(under subclass 200) Subject matter under Class 219, ... wherein the heating device comprises an electrical heating element in combination with at least one other heat source of a nonelectrical nature, e.g., gas, etc.

(1) Note. The other heat source may be utilized either simultaneously or alternately with the electrical device.

SEE OR SEARCH CLASS

219, Electric Heating,

601, for inductive heating with diverse type heating; for microwave heating see subclass 679 with a diverse device and

subclasses 680+ with diverse-type heating.

432, Heating,

94, for disparate heat sources or fuels.