US PATENT SUBCLASS 313 / 488
.~.~.~ Aperture-type tube

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}
488.~.~.~ Aperture-type tube

DEFINITION

Classification: 313/488

(under subclass 485) Subject matter wherein an aperture or discontinuity is provided in the fluorescent or phosphorescent layer or coating or wherein some other means is provided to permit or direct light from the interior of the envelope.