US PATENT SUBCLASS 324 / 464
.~ For analysis of gas, vapor, or particles of matter

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

459  DF  USING IONIZATION EFFECTS {2}
464.~ For analysis of gas, vapor, or particles of matter {6}
465  DF  .~.~> Using electronegative gas sensor
466  DF  .~.~> Using a filter
467  DF  .~.~> Using test material desorption
468  DF  .~.~> Using thermal ionization
469  DF  .~.~> Using a radioactive substance
470  DF  .~.~> Using thermionic emission

DEFINITION

Classification: 324/464

For analysis of gas, vapor, or particles of matter:

(under subclass 459) Subject matter wherein a gas, vapor, or particles of matter to be monitored are ionized and the ionized material is then monitored to determine properties of the material itself.

(1) Note. The discharge properties of a gas, vapor, etc., can be monitored, i.e., current and voltage. Also, the glow of the discharge can be used to indicate the properties of the test material.

SEE OR SEARCH CLASS

23, Chemistry: Physical Processes,

232, for gas analysis wherein a chemical reaction is involved.

73, Measuring and Testing,

19+, for gas analysis wherein the gas is not ionized as part of the analysis.

250, Radiant Energy, appropriate subclasses for similar subject matter specifically provided for therein. 340, Communications: Electrical,

629, for ionization gas detectors wherein the indication is in the form of an alarm. If the indication is nonquantitative, i.e., alarm, classification is in Class 340. If indication is quantitative (except for smoke detectors as noted above in Class 250) or there is a combination of quantitative and nonquantitative indicators, classification is in Class 324.