US PATENT SUBCLASS 219 / 509
.~.~ Automatically operated

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

200  DF  HEATING DEVICES {14}
507  DF  .~ With current connection and/or disconnection means (e.g., switch) {2}
509.~.~ Automatically operated {3}
510  DF  .~.~.~> Thermally responsive {7}
518  DF  .~.~.~> Responsive to weight, position, or presence of body to be heated
519  DF  .~.~.~> Including electromagnetic relay means

DEFINITION

Classification: 219/509

(under subclass 507) Subject matter wherein the current connection or disconnection function is automatically accomplished as a result of some existing condition within the heated medium or of the heating element itself.

SEE OR SEARCH THIS CLASS, SUBCLASS:

257, for automatically controlled electric flatiron type device.

263+, for automatically controlled resistive type igniter.

309, for forced flow liquid heater with flow responsive switching means.

332, for liquid heater with vapor pressure responsive current control means.

333, for liquid heater with liquid level current control means. 452, for planar surface heater with automatically operated switch means.

490+, for heaters in general with automatic current regulating means.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

116+, for condition responsive switching systems.