US PATENT SUBCLASS 250 / 564
.~.~ With circuit for evaluating a fluent material

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
206  DF  .~ Photocell controlled circuit {9}
564.~.~ With circuit for evaluating a fluent material {1}
565  DF  .~.~.~> With comparison

DEFINITION

Classification: 250/564

(under subclass 206) Subject matter including a circuit responsive to a photocell having fluent material in its optical path, wherein the circuit provides an output indicative of the density, scattering properties, index of refraction or the like, of the fluent material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

573+, for fluent material in the optical path of a prephotocell system.