US PATENT SUBCLASS 219 / 426
.~.~.~ With significant heating unit structure or composition

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.~.~.~ With significant heating unit structure or composition {1}
427  DF  .~.~.~.~> Container comprises resistance heating element

DEFINITION

Classification: 219/426

(under subclass 420) Subject matter wherein the structural combination includes significant details of at least one heating unit in heat exchange relationship with a container of the crucible or furnace type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

538+, for significant heating unit structure applicable to heating devices in general under the class definition.

SEE OR SEARCH CLASS

373, Industrial Electric Heating Furnaces,

94+, for electrode holders and adjustment means for arc furnaces and subclasses 128+ for significant resistance elements and mountings for resistance furnaces.