US PATENT SUBCLASS 250 / 559.28
.~.~.~.~ With translucent material

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
559.01  DF  .~ With circuit for evaluating a web, strand, strip, or sheet {13}
559.19  DF  .~.~ Measuring dimensions {6}
559.27  DF  .~.~.~ Thickness {1}
559.28.~.~.~.~ With translucent material

DEFINITION

Classification: 250/559.28

With translucent material:

(under subclass 559.27) Subject matter wherein photocells are arranged to detect light which has passed through the material from a source on the opposite side of the material.

SEE OR SEARCH CLASS

356, Optics: Measuring and Testing,

382, for measuring of thickness of light permeable material with an optical system.