US PATENT SUBCLASS 313 / 593
.~.~.~.~ Plural

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  DF  .~.~.~ With control electrode {1}
593.~.~.~.~ Plural

DEFINITION

Classification: 313/593

Plural:

(under subclass 592) Subject matter wherein there are two or more control electrodes within the envelope.

(1) Note. If a thyratron is claimed, the cathode may be stated as a "cathode" rather than a thermionic or an electrically heated cathode.

(2) Note. Classified here are shield grid thyratrons.