US PATENT SUBCLASS 313 / 271
.~ For filament

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}
271.~ For filament {6}
272  DF  .~.~> Plural filaments
273  DF  .~.~> Plural section filament
274  DF  .~.~> Supports supported by opposed parts of envelope
275  DF  .~.~> Insulator supports filament {2}
278  DF  .~.~> Tension device for filament
279  DF  .~.~> Support intermediate of filament ends

DEFINITION

Classification: 313/271

(under subclass 238) Devices which have supporting and/or spacing structure for a filament.

(1) Note. Many of the patents in this and the indented subclasses are patents for incandescent lamps. Where only the supporting and spacing structure for an incandescent lamp filament is disclosed and claimed, the patent is classified in this or one of the indented subclasses and is not cross-referenced into any of the subclasses below this or the indented subclasses. Where novel structure in addition to the mere filament supporting and/or spacing structure is disclosed or claimed, appropriate cross-references are made.

SEE OR SEARCH THIS CLASS, SUBCLASS:

244+, for discharge devices under subclass 238 which have an envelope and a plurality of electrodes, one of which is a filament supported within the envelope.

315+, for miscellaneous incandescent lamps. Patents claiming incandescent lamps but which do not claim any significant supporting and/or spacing structure for the lamp filament are classified in subclasses 315+ or in one of the subclasses specified in the notes to the definition of that subclass.

SEE OR SEARCH CLASS

248, Supports, 49+, for miscellaneous pipe or cable supports.