US PATENT SUBCLASS 356 / 435
.~.~.~ With plural detectors (e.g., simultaneous viewing)

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

432  DF  FOR LIGHT TRANSMISSION OR ABSORPTION {3}
433  DF  .~ By comparison {1}
434  DF  .~.~ Photoelectric (e.g., sequential viewing) {1}
435.~.~.~ With plural detectors (e.g., simultaneous viewing)

DEFINITION

Classification: 356/435

With plural detectors (e.g., simultaneous viewing):

(under subclass 434) Subject matter including a plurality of photodetectors, usually one being stimulated by the light from the specimen and the other being stimulated by the standard light.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222, for photometers with plural detectors.

SEE OR SEARCH CLASS

250, Radiant Energy,

208+, for plural photocell controlled circuits; and subclass 578 for optical or prephotocell systems containing plural photocells.