US PATENT SUBCLASS 250 / 214 R
.~.~ Special photocell or electron tube circuits

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
206  DF  .~ Photocell controlled circuit {9}
214 R.~.~ Special photocell or electron tube circuits {15}
214 P  DF  .~.~.~> Photographic control
214 D  DF  .~.~.~> Light dimmers
214 A  DF  .~.~.~> Amplifier type {1}
214 PR  DF  .~.~.~> Photosensitive rheostat type
214 SG  DF  .~.~.~> Self-generating type
214.1  DF  .~.~.~> Special photocell
214 AG  DF  .~.~.~> Automatic gain control
214 AL  DF  .~.~.~> Ambient light responsive
214 B  DF  .~.~.~> Ambient light desensitizing means
214 C  DF  .~.~.~> Compensation
214 DC  DF  .~.~.~> Digital circuitry
214 L  DF  .~.~.~> Logarithmic/linear signal
214 RC  DF  .~.~.~> Rate of change
214 SF  DF  .~.~.~> Slave flash
214 SW  DF  .~.~.~> Electronic switch

Unofficial Alpha Subclasses: R P D A LA LS VT PR SG AG AL B C DC RC SF SW

DEFINITION

Classification: 250/214

(under subclass 206) Subject matter including means to electrically connect a particular photocell or electron tube with one or more electrical or electronic devices in a closed or closable electrically conducting path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

315, Electric Lamp and Discharge Devices: Systems, subclasses 10+ for photocell circuits in which the photocell controls a cathode-ray tube or in which the photocell is part of a cathode-ray tube, and subclasses 149+ for photocell circuits in which the photocell controls a lamp or gas or vapor discharge device.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses, particularly

59, for light controlled or light activated devices.