US PATENT SUBCLASS 219 / 502
.~.~.~ Utilizing light-sensitive and/or responsive 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}
502.~.~.~ Utilizing light-sensitive and/or responsive means

DEFINITION

Classification: 219/502

(under subclass 490) Subject matter wherein the automatic regulating or control means includes photoelectric or other light responsive means.

SEE OR SEARCH CLASS

250, Radiant Energy,

336.1, for methods and apparatus involving the detection of invisible radiant energy by electric signalling means and subclass 472.1 for methods and apparatus to detect invisible radiant energy nonelectric signalling devices and subclasses 200+ for photo-cell circuits and apparatus in general.

315, Electric Lamp and Discharge Devices: Systems,

149+, for gas tube or electric lamp systems controlled by radiant energy.

323, Electricity: Power Supply or Regulation Systems, 221, for automatic control systems comprising photosensitive controlled electron tube systems.

338, Electrical Resistors,

15+, for resistance devices whose resistance value is responsive to light means.

361, Electricity: Electrical Systems and Devices,

173+, for electric circuits for relays and electromagnetic utilizing photo-sensitive devices.