US PATENT SUBCLASS 356 / 943
.~.~.~ Using photo-electric detection (GO1N 21/27)


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356 /   HD   OPTICS: MEASURING AND TESTING

928  DD  INVESTIGATING OR ANALYZING MATERIALS BY THE USE OF OPTICAL MEANS, I.E., USING INFRA-RED, VISIBLE, OR ULTRA-VIOLET LIGHT (GO1N 21/00) {5}
931  DD  .~ Systems in which incident light is modified in accordance with the properties of material investigated (GO1N 21/17) {8}
939  DD  .~.~ Color; spectral properties, i,e., comparison of effect of material on the light at two or more different wavelengths or wavelength bands (GO1N 21/25) {4}
943.~.~.~ Using photo-electric detection (GO1N 21/27) {1}
944  DD  .~.~.~.~> For following a reaction, e.g., for determining photometrically a reaction rate (GO1N 21/27C)