US PATENT SUBCLASS 73 / 23.2
GAS ANALYSIS

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

23.2GAS ANALYSIS {15}
23.21  DF  .~> With compensation detail (for error or drift correction, etc.) {2}
23.3  DF  .~> Breath analysis
23.31  DF  .~> Gas of combustion {1}
23.34  DF  .~> Odor
23.35  DF  .~> Gas chromatography {7}
24.01  DF  .~> By vibration {5}
25.01  DF  .~> By thermal property {4}
28.01  DF  .~> Solid content of gas {3}
29.01  DF  .~> Moisture content or vapor pressure {4}
30.01  DF  .~> Density or specific gravity {3}
31.01  DF  .~> Ambient air {1}
31.03  DF  .~> Impurity
31.04  DF  .~> Pressure
31.05  DF  .~> Detector detail {1}
31.07  DF  .~> Particular separator

DEFINITION

Classification: 73/23.2

GAS ANALYSIS:

(under the class definition) Subject matter comprising a process or an apparatus for detecting or measuring the composition of, or some constituent of, a gas or gaseous mixture.

SEE OR SEARCH CLASS

250, Radiant Energy,

253+, for the detection of a gas within or emanating from the earth by invisible radiation emanating from the gas naturally or as a result of irradiation by invisible radiation, subclasses 336.1+ for testing of a gas by utilizing an electric signalling device detecting radiation induced or emitted naturally, or detecting infrared, ultraviolet, X-ray, or gamma radiation or neutrons modified by the gas.

324, Electricity: Measuring and Testing, appropriate subclasses for testing and electrical property of a gas.

338, Electrical Resistors,

34+, for a resistor, per se, which is responsive to the condition of a gas wherein no quantitative measurements of the gas are disclosed. 340, Communications: Electrical,

632+, for an electrical indicator providing a humanly perceptible signal representing a predetermined condition of a gas.

356, Optics: Measuring and Testing,

402+, for gas analysis utilizing a colorimeter to determine the shade or color of the gas.

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

50+, for an apparatus utilizing a chemical reaction to analyze gas.

436, Chemistry: Analytical and Immunological Testing,

68, for a process which utilizes a chemical reaction to analyze gas.