US PATENT SUBCLASS 219 / 406
.~.~.~ With resistance heating means surrounding heating area

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}
406.~.~.~ With resistance heating means surrounding heating area {1}
407  DF  .~.~.~.~> Embedded within or between walls of container

DEFINITION

Classification: 219/406

(under subclass 391) Subject matter including resistance means surrounding at least a major portion of the heating area of an oven type enclosure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

210, for heating devices combined with electrical devices of a vibrating type (e.g., piezoelectric crystals and employing ovens with an external heating winding).

300, for heaters wherein the liquid conveying tube is the heater.

301, for liquid heaters wherein the heater unit surrounds the liquid conveying tube.

424, for crucible or furnace with the heating element surrounding the wall of the crucible or furnace. SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

341+, for crystal ovens with electric heating means.