(under subclass 350) Subject matter including filters or mirrors having a liquid or gas which is specially adapted as by composition to transmit or absorb infrared or ultraviolet radiation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
665+, for fluid lenses.
832, for fluid filled prisms.
845, for fluid cooled mirrors.
886, for fluid absorption filters which operate in the visible portion of the spectrum.
SEE OR SEARCH CLASS
250, Radiant Energy, 226, for color filter or spectroscope optical or pre-photocell system.
252, Compositions,
582+, for light transmission modifying compositions and subclass 588 for those compositions used for ultraviolet light transmission modifying.
