US PATENT SUBCLASS 356 / 437
.~.~ Gas

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}
437.~.~ Gas {1}
438  DF  .~.~.~> Exhaust, dust or smoke {1}

DEFINITION

Classification: 356/437

Gas:

(under subclass 436) Subject matter wherein the fluent material is a gaseous substance.