US PATENT SUBCLASS 313 / 493
.~.~.~ Envelope structure or material


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}
493.~.~.~ Envelope structure or material


DEFINITION

Classification: 313/493

(under subclass 485) Subject matter wherein the envelope has a particular configuration or chemical composition.