US PATENT SUBCLASS 219 / 209
.~.~ Electrical devices


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

200  DF  HEATING DEVICES {14}
201  DF  .~ Combined with diverse-type art device {12}
209.~.~ Electrical devices {1}
210  DF  .~.~.~> Crystal or other vibratory device


DEFINITION

Classification: 219/209

(under subclass 201) Subject matter wherein the other art device comprises a device which is electrically operated or whose operative function is to control the condition of an electrical circuit, such as a motor or switch.

SEE OR SEARCH THIS CLASS, SUBCLASS:

511, for thermally responsive circuit actuating means with auxiliary heating means.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

341+, for piezoelectric crystals combined with temperature control means, subclass 16 for reciprocating dynamoelectric devices with temperature modification means and subclass 110 for clutches or brakes with means to dissipate induced energy in an external impedance.

313, Electric Lamp and Discharge Devices, 15+, for discharge devices with electric heater temperature modifying means.

315, Electric Lamp and Discharge Devices: Systems,

32+, for systems with load device temperature modifying means and electrical circuit device, particularly subclasses 46+ and 49+.

322, Electricity: Single Generator Systems,

81, for thermally varied resistance impedance circuit control means.

329, Demodulators,

202, for detectors wherein the signals effect a thermal charge in an impedance.

331, Oscillators,

70, for oscillators with a temperature modifier and, subclass 78 for electrical noise or random wave generators of a gaseous type with heating coil means.

332, Modulators, appropriate subclasses for thermal modulators.

336, Inductor Devices, 55+, for inductor devices with temperature modification means.

337, Electricity: Electrothermally or Thermally Actuated Switches,

75, 102+, 120, 141, and 377 for specific type electrothermal and thermal responsive actuating means.

338, Electrical Resistors,

7, for temperature compensated resistive value of a resistor, and subclass 23 for an indirectly heated thermistor.

340, Communications: Electrical,

387.1, for an audible signaling device with weatherproofing (e.g., means to melt sleet off of a signal device, etc.).

343, Communications: Radio Wave Antennas,

704, for antennas with ice clearer or prevention means.