US PATENT SUBCLASS 356 / 439
.~.~.~.~ Contained

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  DF  .~.~ Gas {1}
438  DF  .~.~.~ Exhaust, dust or smoke {1}
439.~.~.~.~ Contained

DEFINITION

Classification: 356/439

Contained:

(under subclass 438) Subject matter wherein there is structure to enclose, at least partially, a gas which has entrained dust or smoke particles.