US PATENT SUBCLASS 324 / 461
.~.~ Using a radioactive substance

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

459  DF  USING IONIZATION EFFECTS {2}
460  DF  .~ For monitoring pressure {3}
461.~.~ Using a radioactive substance

DEFINITION

Classification: 324/461

Using a radioactive substance:

(under subclass 460) Subject matter wherein a radioactive material is used to ionize the gas or vapor in the environment wherein the pressure is being measured.

SEE OR SEARCH CLASS

340, Communications: Electrical,

600, for systems for detecting radiant energy.