US PATENT SUBCLASS 600 / 181
.~.~ With filter, masking, diaphram, or aperture plate

Current as of: June, 1999
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600 /   HD   SURGERY

101  DF  ENDOSCOPE {29}
160  DF  .~ Having imaging and illumination means {16}
181.~.~ With filter, masking, diaphram, or aperture plate

DEFINITION

Classification: 600/181

With filter masking, diaphragm, aperture plate:

(under subclass 160) Subject matter wherein means are provided in the path of the observation system to alter the transmittance of light passing through the optical system.

SEE OR SEARCH CLASS

362, Illumination,

32, for light fibers, rods or pipes.