US PATENT SUBCLASS 250 / 343
.~.~ With means to transmission-test contained fluent material

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.~.~ With means to transmission-test contained fluent material {2}
344  DF  .~.~.~> Plural series signalling means
345  DF  .~.~.~> Plural beam/detector pairs {1}

DEFINITION

Classification: 250/343

(under subclass 338.1) Subject matter having a source of infrared radiation in addition to the signalling means and means to confine a gas, fluid or fluid-like material between the source and the signalling means so that the signalling means responds to radiation, from the source, that passes through the material.

SEE OR SEARCH CLASS

137, Fluid Handling,

2+, for processes using IR transmission tests to control the concentration of a mixture of fluent materials and subclass 93 for corresponding apparatus.

202, Distillation: Apparatus,

40, for automatic control of distillation apparatus by means of infrared absorption test.

260, Chemistry of Carbon Compounds, 683.4, for control of concentrations by IR transmission tests.