US PATENT SUBCLASS 219 / 501
.~.~.~ Including semiconductor means (e.g., transistor)

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}
490  DF  .~.~ Automatic regulating or control means {11}
501.~.~.~ Including semiconductor means (e.g., transistor)

DEFINITION

Classification: 219/501

(under subclass 490) Subject matter wherein the regulating or control structure includes devices comprised of semiconductor material such as transistors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

500, for heater regulators utilizing electron tubes or gaseous discharge tubes.

505, for heater regulator utilizing nonlinear or negative temperature coefficient resistance resistors.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors,

Solid-State Diodes), 53, 56, 108, 414, and 467-470 for such as temperature responsive devices, per se.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, appropriate subclasses for miscellaneous circuits utilizing a transistor.