US PATENT SUBCLASS 219 / 427
.~.~.~.~ Container comprises resistance heating element

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}
420  DF  .~.~ Crucible or furnace type (i.e., adapted to hold meltable material) {6}
426  DF  .~.~.~ With significant heating unit structure or composition {1}
427.~.~.~.~ Container comprises resistance heating element

DEFINITION

Classification: 219/427

(under subclass 426) Subject matter wherein the heating element of the device is comprised of at least a portion of the container walls or structure.

(1) Note. The heating effect in this subclass is caused by the [supscrpt]2[end supscrpt]R loss in the resistive wall and should be differentiated from the arc type furnace where the furnace wall may constitute one electrode of the heating means or those resistance furnaces where the charge constitutes the electrical resistance.

SEE OR SEARCH THIS CLASS, SUBCLASS:

300, for circulatory water heating devices where the liquid conveying conduit comprises the resistance element.

436, for heaters wherein the vessel wall may comprise the heating element.