US PATENT SUBCLASS 349 / 104
.~.~ Filter

Current as of: June, 1999
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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

56  DF  PARTICULAR STRUCTURE {7}
84  DF  .~ Having significant detail of cell structure only {17}
104.~.~ Filter {3}
105  DF  .~.~.~> Interference filter
106  DF  .~.~.~> Color filter {3}
110  DF  .~.~.~> Opaque mask or black mask {1}

DEFINITION

Classification: 349/104

Filter:

(under subclass 84) Subject matter including a particular light absorbing device to attenuate particular wavelengths or frequencies while passing others on with relatively no change.

(1) Note. Included here are infrared and ultraviolet filters.