US PATENT SUBCLASS 313 / 489
.~.~.~ With protective coating or filter

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}
489.~.~.~ With protective coating or filter

DEFINITION

Classification: 313/489

(under subclass 485) Subject matter including a film, coating, or element on the envelope or the fluorescent or phosphorescent material for protection or an optical filter to limit the frequency of the emitted light.