US PATENT SUBCLASS 250 / 575
.~.~.~ Plural paths

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}
575.~.~.~ Plural paths

DEFINITION

Classification: 250/575

(under subclass 573) Subject matter including more than one optical path or separate fluent materials in one optical path.

(1) Note. The subject matter of this subclass includes the provision of one path for the fluent material and a reference path which may include only the ambient atmosphere.