US PATENT SUBCLASS 356 / 409
.~ Fluid color transmission examination

Current as of: June, 1999
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356 /   HD   OPTICS: MEASURING AND TESTING

402  DF  BY SHADE OR COLOR {10}
409.~ Fluid color transmission examination {4}
410  DF  .~.~> Of flowing liquids {1}
412  DF  .~.~> With ionic determination
413  DF  .~.~> With variable light path length
414  DF  .~.~> With color transmitting filter {1}

DEFINITION

Classification: 356/409

Fluid color transmission examination:

(under subclass 402) Subject matter wherein a fluid substance, a solute in a solvent, or a miscible liquid is examined by a transmissive light test (quantitatively or qualitatively) for the purpose of noting color, different shades or tints of colors, or the concentration of a solute in a solvent.

(1) Note. Patents dealing with chromatography include a mass or masses of chemically absorptive material supported in a transparent conduit so that a confined flow of liquid or gaseous material through the chemically absorptive material may produce a selective colored band or bands held in layers by absorptive phenomena. The layers and their interfaces may be examined visually or by radiation sensitive instruments to furnish qualitative determinations with respect to the chemical composition of the material analyzed. Those patents with significant claimed subject matter involving an optical color test following the absorption of a constituent of a liquid or gaseous material are included as originals in this schedule.

SEE OR SEARCH CLASS

73, Measuring and Testing,

23.35, and 53.01+ for the methods and apparatus for examining the band or bands of the chromatography column to determine the quantity, quality, or the substances of the band or bands in a gas or liquid chromatography test.

95, Gas Separation: Processes,

82+, for processes of gas separation using chromatography.

96, Gas Separation: Apparatus, 101+, for chromatography type apparatus for gas separation.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,

50+, for analytical apparatus involving chromatography or a colorimeter wherein a reactive reagent is used to develop color.

436, Chemistry: Analytical and Immunological Testing, for processes involving the combination of a gas or liquid chromatography test with a colorimetry test of the colored band or bands from the chromatography column where a chemically reactive reagent is necessary to develop the color for the colorimetry test.