US PATENT SUBCLASS 219 / 498
.~.~.~.~ Including follow-up servo means

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}
497  DF  .~.~.~ Comprising voltage and/or current measuring and comparing or combining means {2}
498.~.~.~.~ Including follow-up servo means

DEFINITION

Classification: 219/498

(under subclass 497) Subject matter including follow-up or servo-motor means whereby the current applied to the heating device is responsive to a reference voltage as derived by the means of that subclass.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, particularly

74+, for electric motor servo systems utilizing automatic temperature or humidity control systems.

318, Electricity: Motive Power Systems,

609+, for "Reset" position servomechanisms which may be used for temperature control, and subclass 641, for position servomechanisms in which the error detector is a temperature measuring instrument.