US PATENT SUBCLASS 219 / 425
.~.~.~ With current or voltage control means

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}
425.~.~.~ With current or voltage control means

DEFINITION

Classification: 219/425

(under subclass 420) Subject matter wherein the structure claimed includes means whereby the voltage or current applied to the heating unit or units of the apparatus can be varied at will, maintained between preselected limits or cut off completely. The controlling means may be either manual, automatic or a combination of the two.

SEE OR SEARCH THIS CLASS, SUBCLASS:

482+, below for heating devices under the class definition

combined with power supply, voltage or current regulation or current control means.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems.

373, Industrial Electric Heating Furnaces, 135+, for electric furnaces combined with control systems.