US PATENT SUBCLASS 353 / 55
.~ Heat filter

Current as of: June, 1999
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353 /   HD   OPTICS: IMAGE PROJECTORS

52  DF  TEMPERATURE CONTROL {5}
55.~ Heat filter

DEFINITION

Classification: 353/55

(under subclass 52) Subject matter including a sheet of material in the optical path which at least partially separates the heat or infrared energy from the visible-light energy; by absorbing the heat energy, by reflecting the heat energy and transmitting the visible light, or by transmitting the heat energy while reflecting the visible light toward the object to be projected.

SEE OR SEARCH CLASS

352, Optics: Motion Pictures,

148, for a heat filter in a motion-picture projector.

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

350+, for heat filters generally. 362, Illumination,

293, for a light projector having a heat filter.