US PATENT SUBCLASS 356 / 235
.~.~ Absorber continuously variable (e.g., wedge)

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

213  DF  PHOTOMETERS {9}
234  DF  .~ Light absorbing {1}
235.~.~ Absorber continuously variable (e.g., wedge)

DEFINITION

Classification: 356/235

(under subclass 234) Subject matter wherein the optical light attenuating member has a variable light attenuating characteristic in a physical direction along the member to permit variation in the light passing through the member by movement of the member through the optical path.

SEE OR SEARCH CLASS

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

888, for optical wedges.