US PATENT SUBCLASS 352 / 148
.~.~ By filters

Current as of: June, 1999
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352 /   HD   OPTICS: MOTION PICTURES

143  DF  WITH FILM STRIP FIRE PREVENTION OR ISOLATION {4}
146  DF  .~ Film cooling {2}
148.~.~ By filters

DEFINITION

Classification: 352/148

(under subclass 146) Subject matter in which the reduction in temperature is brought about by interposing filters which reduce the amount of the light of longer wave lengths in the projecting light beam.

SEE OR SEARCH CLASS

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

350+, for filters which are operated in the infrared range.