(under subclass 402) Subject matter wherein there are devices which examine light, per se, or the light reflected from or transmitted through substances, and which include means to examine the light or the light modified by reflection or transmission from the substances, simultaneously or sequentially for hue, saturation, and intensity as based upon the response of the human eye.
(1) Note. The devices may be of the visual or the photosensitive type.
SEE OR SEARCH THIS CLASS, SUBCLASS:
300, for devices which examine a substance for tristimulus values where a dispersing element is used rather than color filters to construct the tristimulus curves.
406, for devices which examine light or substances reflectively or transmissively for at least three different colors but not for the tristimulus values.
SEE OR SEARCH CLASS
209, Classifying, Separating, and Assorting Solids, 577+, for apparatus which physically separates one substance from another based upon the tristimulus factors of light.
235, Registers,
61, and 184 for devices which utilize the tristimulus factors obtained in the devices of this subclass 405 to obtain mechanically and electrically the analogue computations necessary to utilize the integrated responses of the tristimulus values.
