US PATENT SUBCLASS 313 / 581
.~ Three or more electrode discharge device

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

567  DF  WITH GAS OR VAPOR {24}
581.~ Three or more electrode discharge device {9}
582  DF  .~.~> Multiple gaseous discharge display panel {2}
588  DF  .~.~> Amplifier, cathanode, or ionic cathode
589  DF  .~.~> Counter, indicator, or switching tube
590  DF  .~.~> With shield to prevent discharge between electrodes
591  DF  .~.~> Having cathode heater {1}
594  DF  .~.~> Start electrode exterior to envelope
595  DF  .~.~> Internal start or control electrode between discharge electrodes {3}
601  DF  .~.~> Start electrode not in main discharge path {2}
604  DF  .~.~> Plural serial electrodes

DEFINITION

Classification: 313/581

Three or more electrode discharge device:

(under subclass 567) Subject matter wherein the discharge device includes at least three electrodes within the envelope.

(1) Note. See the glossary for the definition of the term "electrode".

SEE OR SEARCH THIS CLASS, SUBCLASS:

162, for a discharge device or lamp having a movable electrode or shield in an envelope having three or more electrodes.

163+, for a liquid electrode discharge device having three or more electrodes, particularly subclass 168 for plural anodes in separate envelope chambers.

306+, for a discharge device having three or more electrodes.

568+, for a lamp or discharge device having a particular total or partial gas or vapor pressure.

SEE OR SEARCH CLASS 315, Electric Lamp and Discharge Devices: Systems,

334+, and the subclasses specified in the notes for systems for supplying electrical energy to gas or vapor discharge devices which have a plurality of cathodes and/or anodes and subclasses 349+ and the subclasses cited in the notes thereto

for systems supplying electrical energy to gas or vapor type discharge devices which have a control electrode.