US PATENT SUBCLASS 250 / 208.4
.~.~.~ Used to switch an electrical circuit or device on or off

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}
208.2  DF  .~.~ Plural photosensitive nonimage detecting elements {4}
208.4.~.~.~ Used to switch an electrical circuit or device on or off

DEFINITION

Classification: 250/208.4

Used to switch an electrical circuit or device on or off:

(under subclass 208.2) Subject matter in which plural photocells are, by disclosure, used to generate signals which are used to switch all or just part of an electrical circuit on or off.

SEE OR SEARCH THIS CLASS, SUBCLASS:

214, for photocell controlled switching circuits, per se.

SEE OR SEARCH CLASS

340, Communications: Electrical,

500+, for condition responsive devices which are responsive to radiant energy and which use photocell controls to turn on alarms or other indicators in response to a specific condition sensed by the photocells.

361, Electricity: Electrical Systems and Devices,

174+, for condition responsive control systems for electromagnetic devices which use a light sensor for controlling its light path.