US PATENT SUBCLASS 356 / 442
.~.~.~ With light detector

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

432  DF  FOR LIGHT TRANSMISSION OR ABSORPTION {3}
436  DF  .~ Of fluent material {3}
441  DF  .~.~ Having particles suspended in liquid {1}
442.~.~.~ With light detector

DEFINITION

Classification: 356/442

With light detector:

(under subclass 441) Subject matter including photosensitive means responsive to light passing through the fluent material.