US PATENT SUBCLASS 313 / 493
.~.~.~ Envelope structure or material
Current as of:
June, 1999
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313 /
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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.