US PATENT SUBCLASS 324 / 470
.~.~ Using thermionic emission

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}
470.~.~ Using thermionic emission

DEFINITION

Classification: 324/470

Using thermionic emission:

(under subclass 464) Subject matter wherein a heated element emits electrons which ionize the gas, vapor, etc., to be analyzed.