US PATENT SUBCLASS 250 / 574
.~.~.~ Scattered or reflected light

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
573  DF  .~.~ Fluent material in optical path {4}
574.~.~.~ Scattered or reflected light

DEFINITION

Classification: 250/574

(under subclass 573) Subject matter including structure associated with the photocell or the photocell is so placed as to be responsive to light dispersed, scattered or reflected by the fluent material.