US PATENT SUBCLASS 250 / 345
.~.~.~ Plural beam/detector pairs

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

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
338.1  DF  .~ Infrared responsive {12}
343  DF  .~.~ With means to transmission-test contained fluent material {2}
345.~.~.~ Plural beam/detector pairs {1}
346  DF  .~.~.~.~> Plural temperature sensitive signalling means

DEFINITION

Classification: 250/345

(under subclass 343) Subject matter wherein the source of infrared radiation forms two or more beams with at least one beam being transmitted through the contained material, and two or more electric signalling means, one responsive to radiation transmitted through the contained material and at least one in the path of one of the other beams.

SEE OR SEARCH THIS CLASS, SUBCLASS:

252.1, for methods of standardizing the apparatus of this subclass type.

339.01+, for means forming two or more beams of different wavelengths or bands which may be combined with a contained fluent and a detector in two or more of the radiation paths.