US PATENT SUBCLASS 313 / 31
.~.~ Tubular coil electrode

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

11  DF  WITH TEMPERATURE MODIFIER {19}
30  DF  .~ Hollow electrode or lead {2}
31.~.~ Tubular coil electrode

DEFINITION

Classification: 313/31

(under subclass 30) Devices in which the electrode is in the form of a fluid conduit which is in the form of a coil.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

100, 178 for pipe structure, per se.

165, Heat Exchange, appropriate subclasses for a heat exchanger, per se.