US PATENT SUBCLASS 313 / 492
.~.~.~.~ With shield or additional electrode

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

483  DF  WITH LUMINESCENT SOLID OR LIQUID MATERIAL {4}
484  DF  .~ With gaseous discharge medium {1}
485  DF  .~.~ Phosphor on envelope wall {6}
491  DF  .~.~.~ Electrode structure or material {1}
492.~.~.~.~ With shield or additional electrode

DEFINITION

Classification: 313/492

(under subclass 491) Subject matter including an additional electrode or shielding structure mounted adjacent an electrode to protect either the electrode, the envelope, or the fluorescent or phosphorescent coating.

(1) Note. The additional electrode may be a starting electrode.