US PATENT SUBCLASS 362 / 166
.~.~ Selective wavelength transmitting or light blocking means

Current as of: June, 1999
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362 /   HD   ILLUMINATION

157  DF  SELF POWERED LAMP {16}
159  DF  .~ Nonelectric {9}
166.~.~ Selective wavelength transmitting or light blocking means {2}
167  DF  .~.~.~> With separate movable selective elements {1}
169  DF  .~.~.~> Plural lenses {1}

DEFINITION

Classification: 362/166

(under subclass 159) Subject matter having means to absorb a portion of the light ray energy and transmit the remainder or means to stop all light ray energy from being transmitted.