US PATENT SUBCLASS 359 / 498
.~.~.~.~ Frequency filter or interference effects

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

483  DF  POLARIZATION WITHOUT MODULATION {2}
485  DF  .~ Light polarization without any external input {8}
494  DF  .~.~ By birefringent element {4}
497  DF  .~.~.~ Using plural elements {2}
498.~.~.~.~ Frequency filter or interference effects

DEFINITION

Classification: 359/498

Frequency filter or interference effects:

(under subclass 497) Subject matter wherein plural elements act to pass a particular frequency or band of frequencies, or

wherein interference effects are used to produce effects such as color or an interference pattern.

SEE OR SEARCH THIS CLASS, SUBCLASS:

370+, for interference microscopes which may utilize birefringent elements.

490, for color effects using dichroic medium.

634, for wavelength selective beam splitting systems.

885+, for an absorption filter.