US PATENT SUBCLASS 313 / 245
.~.~.~ Plural discharge spaces formed by three or more electrodes

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}
243  DF  .~ For plural electrodes of discharge device {3}
244  DF  .~.~ Envelope supports or forms electrode {5}
245.~.~.~ Plural discharge spaces formed by three or more electrodes

DEFINITION

Classification: 313/245

(under subclass 244) Discharge devices having means for supporting and/or spacing three or more electrodes which are arranged to form a plurality of separate discharge spaces.

(1) Note. Included in this subclass are discharge devices having a plurality of anodes and a cathode, or a plurality of cathodes and an anode. Also included are cross-references of discharge devices of the plural unit type (e.g., each cathode having a separate anode) where significant supporting and/or spacing structure is disclosed.

(2) Note. This and the indented subclasses do not provide for the supporting and spacing structure for discharge devices which are provided only with a cathode, a second electrode (e.g., anode) with which the cathode forms a first discharge space, and a third electrode in the form of a grid or foraminous electrode interposed in the discharge space formed by the cathode and second electrode even though the disclosure and claims of the patent state that the third electrode is intended to receive electrons emitted by the cathode. The supporting and/or spacing structure for such discharge devices is in subclass 265 and the subclasses specified in the notes to the definition of that subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+, for plural unit discharge devices (i.e., discharge devices having a plurality of separate cathodes, each cathode having a separate anode).

239+, for this subject matter where the discharge device includes a shield between the separate discharge spaces and means for supporting the shield.

265, see (2) note, above. 306+, and the subclasses specified in the notes thereto for patents for discharge devices having three or more electrodes arranged to form a plurality of separate discharge spaces where no significant supporting and/or spacing structure for the electrodes is claimed.