US PATENT SUBCLASS 313 / 497
.~.~.~ With accelerating or control electrode

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

483  DF  WITH LUMINESCENT SOLID OR LIQUID MATERIAL {4}
495  DF  .~ Vacuum-type tube {1}
496  DF  .~.~ Phosphor on anode segments {1}
497.~.~.~ With accelerating or control electrode

DEFINITION

Classification: 313/497

(under subclass 496) Subject matter including an electrode between cathode and anode segments to direct or permit electrons to strike a particular segment.