US PATENT SUBCLASS 355 / 68
.~.~ Including photocell or phototube

Current as of: June, 1999
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355 /   HD   PHOTOCOPYING

18  DF  PROJECTION PRINTING AND COPYING CAMERAS {27}
67  DF  .~ Illumination systems or details {4}
68.~.~ Including photocell or phototube

DEFINITION

Classification: 355/68

(under subclass 67) Subject matter including a photoelectric cell or photomultiplier tube and related electric circuitry to detect the intensity of light in some part of the optical path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

38, for a copier including a photocell or phototube for copying multicolor pictures.

41, for a projection copier with identifying, composing, or selecting means including a photocell means.