US PATENT SUBCLASS 324 / 466
.~.~ Using a filter

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

459  DF  USING IONIZATION EFFECTS {2}
464  DF  .~ For analysis of gas, vapor, or particles of matter {6}
466.~.~ Using a filter

DEFINITION

Classification: 324/466

Using a filter:

(under subclass 464) Subject matter wherein a filter or membrane is used, which passes only the gas, vapor, etc., which is to be tested, to the ionization chamber where it is ionized and analyzed.