US PATENT SUBCLASS 250 / 379
.~.~ With means to supply the gas

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

336.1  DF  INVISIBLE RADIANT ENERGY RESPONSIVE ELECTRIC SIGNALLING {16}
374  DF  .~ Including a radiant energy responsive gas discharge device {8}
379.~.~ With means to supply the gas {2}
380  DF  .~.~.~> Radioactive gas, or with gas-borne radioactive material
381  DF  .~.~.~> With radioactive source

DEFINITION

Classification: 250/379

(under subclass 374) Subject matter combined with means to move or permit movement of gas to, through, or away from the space between the electrodes.

(1) Note. Vapors as well as gases are used to ionize the space between the electrodes of the device.