(under subclass 3) Subject matter having an electrical device which responds to radiant light energy by (1) varying its electrical characteristics, (2) generating an electric current, or (3) means for determining the intensity or quantity of light emanating from a particular location or direction, wherein any of the aforementioned three are combined with photos:graphic illumination structure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
6, for devices which respond to infrared radiation or other forms of thermal energy.
SEE OR SEARCH CLASS
250, Radiant Energy,
200+, for photocells, circuits and apparatus, especially subclass 215 where combined with a diverse type device.
315, Electric Lamp and Discharge Devices: Systems, 149+, where the system is combined with radiant energy sensitive control means.
356, Optics: Measuring and Testing,
213+, for photometers per se and see the search class notes for other fields of search.
361, Electricity: Electrical Systems and Devices,
173+, for relays and solenoids combined with light condition responsive means.
396, Photography,
155+, for combinations of photos:graphic lights and significant camera structure which may include light sensing or indicating.
