US PATENT SUBCLASS 313 / 592
.~.~.~ With control electrode

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

567  DF  WITH GAS OR VAPOR {24}
581  DF  .~ Three or more electrode discharge device {9}
591  DF  .~.~ Having cathode heater {1}
592.~.~.~ With control electrode {1}
593  DF  .~.~.~.~> Plural

DEFINITION

Classification: 313/592

With control electrode:

(under subclass 591) Subject matter wherein there is a control grid electrode whose function is to ionize the gas or vapor within the envelope.

(1) Note. Here the grid electrode loses control of the ionized gas when the gas or vapor becomes ionized.

SEE OR SEARCH THIS CLASS, SUBCLASS:

163+, for liquid electrode device particularly subclasses 170+ for an auxiliary starting or holding electrode.

588, for a gas or vapor discharge device wherein the grid does not lose control of the discharge.