US PATENT SUBCLASS 73 / 23.22
.~.~ For gas chromatography

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

23.2  DF  GAS ANALYSIS {15}
23.21  DF  .~ With compensation detail (for error or drift correction, etc.) {2}
23.22.~.~ For gas chromatography {4}
23.23  DF  .~.~.~> Baseline drift correction circuitry
23.24  DF  .~.~.~> Rate of flow
23.25  DF  .~.~.~> Temperature {1}
23.27  DF  .~.~.~> Pressure

DEFINITION

Classification: 73/23.22

For gas chromatography:

(under subclass 23.21) Subject matter in which the effluent of a mixture of gases, which has contacted a solvent or sorbent which separates the mixture into fractional components, is successively tested to determine the quantity, quality or identify of a component of the effluent.

SEE OR SEARCH THIS CLASS, SUBCLASS:

23.35, through 23.40, for a gas analysis detector, per se, which may be used in gas chromatography.

53.01+, for liquid testing (e.g., liquid chromatography).

863+, for sample preparation or sampling, per se.

SEE OR SEARCH CLASS

95, Gas Separation: Processes, 82+, for processes of gas separation, per se (i.e., not combined with analysis steps), using chromatography.

96, Gas Separation: Apparatus,

101+, for apparatus for gas separation, per se (i.e., not combined with analysis means), of the chromatos:graphic type.

204, Chemistry: Electrical and wave Energy,

400+, for an electrochemical gas sensor, per se.

210, Liquid Purification or Separation,

660+, for a process of removing a constituent from a liquid by sorption, particularly subclasses 656+ for selective sorptions (e.g., chromatography), subclasses 85 for a liquid separator with recorder or register, and subclasses 263+ for a liquid separator utilizing a bed of particulate material.

324, Electricity: Measuring, and Testing, particularly

464+, for analyzing gas using ionization effects, and appropriate subclasses for testing gas by measuring impedance, admittance, and related quantities.

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

50+, for an apparatus utilizing a chemical reaction to analyze a gas, particularly subclass 89 for gas chromatography.

436, Chemistry: Analytical and Immunological Testing, particularly

68, for a process utilizing a chemical reaction for determining the gases in the blood, and subclasses 161+ for chromatography.