US PATENT SUBCLASS 359 / 566
.~ From grating

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

558  DF  DIFFRACTION {3}
566.~ From grating {3}
567  DF  .~.~> For ornamental effect or display
568  DF  .~.~> For diffractive subtractive filtering
569  DF  .~.~> Including particular grating characteristic {7}

DEFINITION

Classification: 359/566

From grating:

(under subclass 558) Subject matter wherein diffraction occurs at an optical element having a series of very close lines or fine slits.

(1) Note. The lines on the grating may be ruled grooves or

fine slits may be applied by other mechanical, photos:graphic, holos:graphic, or chemical pro-cesses.

(2) Note. This subclass includes both amplitude and phase gratings and also includes gratings having mounting means therefor.

(3) Note. Excluded from this subclass are acoustic or other compression wave diffraction gratings, see Search Class note to subclass 358.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+, for holos:graphic production of diffraction gratings.

285+, for light control by causing a fluid or deformable medium to act as a diffraction grating under the influence of compressional waves. SEE OR SEARCH CLASS

348, Television,

291, for diffraction gratings which are used for frequency separation in color television systems ("strip filters").

356, Optics: Measuring and Testing,

51, for devices which utilize diffraction gratings in optical test devices involving infrared or ultraviolet application, subclasses 300+ for spectroscopic instruments including spectros:graphic devices in subclasses 305 and 328 which utilize a diffraction grating, subclass 334 for monochromators which use diffraction gratings, subclass 354 for wavefront division by diffraction in interferometers, and subclass 395 for optical test devices employing relatively movable diffraction gratings.

385, Optical Waveguides,

37, for an input/output optical coupler using a grating.