US PATENT SUBCLASS 313 / 628
.~.~ Coil type

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

567  DF  WITH GAS OR VAPOR {24}
627  DF  .~ Having electrode heated by space discharge current {1}
628.~.~ Coil type

DEFINITION

Classification: 313/628

Coil type:

(under subclass 627) Subject matter wherein at least part of the electrode is in the form of a wound spiral.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31, for a lamp or discharge device having a tubular hollow coil electrode with a temperature modifier for the coil.

344, for a coiled resistance heated electrode, per se.