US PATENT SUBCLASS 313 / 573
.~.~.~ Having specified envelope detail

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

567  DF  WITH GAS OR VAPOR {24}
568  DF  .~ Having a particular total or partial pressure {4}
572  DF  .~.~ One torr thru 760 torr {2}
573.~.~.~ Having specified envelope detail

DEFINITION

Classification: 313/573

Having specified envelope detail:

(under subclass 572) Subject matter wherein the envelope is defined in terms of some envelope feature.

(1) Note. The feature may be structural, or composition, or some optical feature, but not merely transparent, translucent, sealed or vitreous.

(2) Note. Included in this subclass are patents to both envelope detail and electrode detail.

SEE OR SEARCH THIS CLASS, SUBCLASS:

317+, for a lamp or discharge device having a particular envelope.

634+, for a gas or vapor discharge device envelope having particular structure including envelopes with a layer or coating or material.

636, for a gas or vapor discharge device having a particular envelope composition.