US PATENT SUBCLASS 359 / 568
.~.~ For diffractive subtractive filtering

Current as of: June, 1999
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359 /   HD   OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS

558  DF  DIFFRACTION {3}
566  DF  .~ From grating {3}
568.~.~ For diffractive subtractive filtering

DEFINITION

Classification: 359/568

For diffractive subtractive filtering:

(under subclass 566) Subject matter wherein diffraction gratings are used to diffractively remove unwanted spectral wavelengths from polychromatic incident light.

SEE OR SEARCH THIS CLASS, SUBCLASS:

885+, for optical filters in general and particularly subclass 888 for neutral or different density filters.