US PATENT SUBCLASS 219 / 486
.~.~.~ Selectively, sequentially or alternately

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
482  DF  .~ With power supply and voltage or current regulation or current control means {4}
483  DF  .~.~ Controlling or regulating plural separate distinct heating resistance elements(i.e., one control system for all elements) {3}
486.~.~.~ Selectively, sequentially or alternately {1}
487  DF  .~.~.~.~> With indicator means

DEFINITION

Classification: 219/486

(under subclass 483) Subject matter comprising means whereby the plurality of resistance heating elements may be selectively activated alternately one at a time, in a predetermined group of two or more, or consecutively one after the other in an order determined by the internal conditions prevailing in the heating device of which they form a part.

SEE OR SEARCH THIS CLASS, SUBCLASS:

401, for ovens with plural selectively energizable heater units.

446, for planar surface heaters with selectively activated heating units.

480, for plural separate heating devices selectively activated.

SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems,

29, and 38+ for systems involving selectively connected or controlled load circuits.