US PATENT SUBCLASS 313 / 239
.~ For shield

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}
239.~ For shield {2}
240  DF  .~.~> Shield supported by electrode, electrode support, or spacer {1}
242  DF  .~.~> Shield supported by or forming part of envelope stem

DEFINITION

Classification: 313/239

(under subclass 238) Devices having supporting and/or spacing structure for a shield.

(1) Note. For the definition of shield, see the glossary in the class definition. Note that shields do not include shield grid electrodes, see the reference to subclass 265 below.

(2) Note. Devices which are provided with an envelope made in whole or part of metal or conductive material and which include supporting and/or spacing structure for an electrode or shield other than the metal or conductive envelope portion (such as an electrode or shield within the envelope or an

electrode or shield exterior to the envelope) are classified as follows. This subclass includes those devices with a metal or conductive envelope where the the envelope is disclosed or claimed as being provided for shielding purposes and where such envelope is not designed for use as an electrode of the device, such as the anode, and no other shielding structure is claimed. Where other shielding structure is claimed, the patent is classified in the appropriate indented subclass. Where the metal or conductive envelope is designed for use as an electrode, the patent is classified in either subclasses 246+ where the supporting and/or spacing structure for a plurality of electrodes is claimed or in subclass 317 where no other supporting or spacing structure is claimed. Where the metal or conductive envelope is not claimed not disclosed as either a shield or as an electrode, but one or more electrodes are supported by the conductive envelope portion, the patent is classified in subclass 248 where the supporting and/or spacing structure for a plurality of electrodes is claimed and in subclass 281 or 282 where the supporting and/or spacing structure for only a single electrode is claimed. Envelopes, per se, having at least a portion of the envelope formed of metal or conductive material are in Class 220, subclass 2.3, or in one of the classes specified in the notes to the definition of that subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11+, for devices under the subclass which are provided with means for supporting and/or spacing a heat transfer device (e.g., radiating fins), or which are provided with means for supporting and/or spacing a heat shielding means. See especially subclasses 37+ where the device is provided with a heat shield for a cathode or filament, and subclass 47 for devices with miscellaneous heat shields.

265, for discharge devices under subclass 238 which have means for supporting a grid electrode or other apertured electrode between two other electrodes (e.g., which have means for supporting a shield grid) but which do not have any means for supporting or spacing a shield. 246+, see (2) Note, above.

248, see (2) Note, above.

281, see (2) Note, above.

282, see (2) Note, above.

317, see (2) Note, above.

SEE OR SEARCH CLASS

220, Receptacles,

2.3, see (2) Note, above.