US PATENT SUBCLASS 219 / 400
.~.~.~.~ By convection

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}
399  DF  .~.~.~ With heat energy transfer, distribution, or accumulator means {1}
400.~.~.~.~ By convection

DEFINITION

Classification: 219/400

(under subclass 399) Subject matter including means whereby heat energy transfer is accomplished by convection currents.

(1) Note. Devices of a similar nature where the entire heating of a closed space is attained by convection currents will be classified above in subclasses 369+ according to the specific details of the heating means utilized with appropriate cross referencing to this subclass whenever the claimed subject matter includes oven structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

359+, for fluid heaters of the convection type, particularly subclass 375 for such heaters with heat storage or transfer means (see also (1) Note above).

SEE OR SEARCH CLASS

99, Foods and Beverages: Apparatus,

467+, for subjecting food to an enclosed modified atmosphere that may be steam. 126, Stoves and Furnaces,

274, for Dutch ovens heated by convection currents from an open fireplace or stove.