.~.~.~> With plural light detectors (e.g., photocells)
DEFINITION
Classification: 356/410
Of flowing liquids:
(under subclass 409) Subject matter including apparatus which forms part of a liquid circulation system which permits constant or intermittent flow of the liquid being examined, and a support for the liquid contained, and which is constructed to allow light to pass through the contained liquid for a visual or photosensitive examination.
(1) Note. Included herein are a comparison of a test fluid with a light standard or with a standard of the same fluid, or a comparison of a voltage which is the result of the detected light transmitted through the fluid tested with a voltage level used as a standard as in a bridge circuit in null type recording and indicating instruments.
SEE OR SEARCH THIS CLASS, SUBCLASS:
51, for infrared energy or filters utilized in the test circuitry.
246, for flow cells, per se.
319+, for spectrophotometers which utilize a dispersing element to produce the light radiation utilized in the same type of selective absorption test.
436+, for light transmission of liquids where no monochromatic light is involved in the test.
SEE OR SEARCH CLASS 137, Fluid Handling,
3, and 93 for methods and apparatus for the control of flowing fluids which involve a color test of this Class 356.
250, Radiant Energy,
356, and 357 for the detection or measurement of invisible radiation used to test fluent material; subclasses 564+ for fluent material in the optical path and a photocell circuit;
and subclasses 573+ for the detection of a fluent material in the optical path.
340, Communications: Electrical,
603+, for electrical condition responsive systems responsive to fluent material which utilize an electrical signalling device such as a light or bell rather than a meter or a recorder.
346, Recorders, particularly
31, 33 for recorders operated by follow-up or rebalancing systems alone or in combination with a nominal optical test where the novelty alone is in the recorder, per se.
422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,
50+, for continuous flowing fluid apparatus involving a color test and in which a chemical reaction occurs.
436, Chemistry: Analytical and Immunological Testing, 1+, for processes involving continuous flowing fluid systems which include a color test wherein a chemical reaction occurs.
