US PATENT SUBCLASS 356 / 319
.~ Utilizing a spectrophotometer (i.e., plural beam)

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

300  DF  BY DISPERSED LIGHT SPECTROSCOPY {10}
319.~ Utilizing a spectrophotometer (i.e., plural beam) {3}
320  DF  .~.~> Having plural wavelengths
321  DF  .~.~> Having servo equalization {1}
323  DF  .~.~> Having beam modulation {2}

DEFINITION

Classification: 356/319

Utilizing a spectrophotometer (i.e., plural beam):

(under subclass 300) Subject matter wherein there are formed two beams of light, one or both beams may be monochromatic, means to support a substance in one or both beams to modify one or both beams, means to detect and compare the intensities of the two beams as modified by the substance or substances simultaneously or sequentially, and means responsive to the comparison means to indicate the relative intensities of the two beams.

SEE OR SEARCH THIS CLASS, SUBCLASS:

213+, for photometers which examine the intensity of visible light by visual and photoelectric methods.

416+, and 425, for colorimeters which utilize filters rather than a dispersing arrangement to determine the intensity of light at specific wavelengths or the absorption characteristics of substances which modify the light transmitted through or reflected from the substances.

432, for photometers which examine light transmitted through a substance.

445+, for photometers which examine light reflected from the surface of a substance.