US PATENT SUBCLASS 359 / 573
.~.~.~ Variable grating

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}
569  DF  .~.~ Including particular grating characteristic {7}
573.~.~.~ Variable grating

DEFINITION

Classification: 359/573

Variable grating:

(under subclass 569) Subject matter wherein the optical characteristics of the diffraction grating can be altered by the application of an external force.

(1) Note. Examples of variable gratings included in this subclass are gratings comprised of electro-optical or magne-to-optical stripe domains.

(2) Note. A stripe domain is a stripe-shaped region having its own proper-ties, such as an ion-shiny electro-optic stripe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

95, for liquid crystal devices exhibiting variable diffraction.

240, for temporal modulation of a light beam by changing the bulk optical parameter.

301+, for polarizer light wave spatial modulation. 483+, for polarization without modulation.

SEE OR SEARCH CLASS

365, Static Information Storage and Retrieval,

122, for polarization information masking using magneto-optical devices.