US PATENT SUBCLASS 313 / 290
.~.~.~.~ Stem or envelope structure

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

238  DF  WITH SUPPORT AND/OR SPACING STRUCTURE FOR ELECTRODE AND/OR SHIELD {9}
283  DF  .~ Electrode supported by envelope {2}
284  DF  .~.~ Electrode supporting member supported by envelope {1}
285  DF  .~.~.~ Supporting wire, rod, or tube supported by envelope {5}
290.~.~.~.~ Stem or envelope structure

DEFINITION

Classification: 313/290

(under subclass 285) Devices which have the structure of the envelope part or the envelope stem or press which supports the electrode supporting wire, rod or tube modified.

(1) Note. This subclass includes patents where significant structure of the envelope part, stem or press which supports the electrode supporting wire, rod or tube is claimed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

266, where the device is a discharge device having a plurality of electrodes supported by supporting wires, rods or tubes.

271, where the electrode supported by the support wires, rods or tubes is a filament.

281, where the envelope includes a conductive wall portion having an aperture, the support being mounted in or around the aperture in the conductive wall portion.

282, where the envelope is provided with a metallic or conductive wall portion, the electrode support being attached to the conductive wall portion. 317+, and the classes specified in the notes to the definition of those subclasses for the structure of envelopes for lamps and discharge devices.