US PATENT SUBCLASS 356 / 323
.~.~ Having beam modulation

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


356 /   HD   OPTICS: MEASURING AND TESTING

300  DF  BY DISPERSED LIGHT SPECTROSCOPY {10}
319  DF  .~ Utilizing a spectrophotometer (i.e., plural beam) {3}
323.~.~ Having beam modulation {2}
324  DF  .~.~.~> With plural dispersion
325  DF  .~.~.~> Prior to testing

DEFINITION

Classification: 356/323

Having beam modulation:

(under subclass 319) Subject matter which includes in the light path structure for periodically varying or blocking the light path in both beams as by a rotating shutter.

SEE OR SEARCH CLASS

250, Radiant Energy,

232+, for light interrupters combined with photocells, and subclasses 336.1+ for methods and apparatus including at least an invisible radiant energy responsive electric signalling device responsive to plural modulated energy beams, especially subclasses 340 and 345+.

359, Optics: Systems (Including Communication) and Elements,

227+, for opaque optical members controlling the passage of light.