US PATENT SUBCLASS 313 / 382
.~.~.~ Focusing

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

364  DF  CATHODE RAY TUBE {11}
365  DF  .~ Image pickup tube {6}
373  DF  .~.~ With photoemissive cathode {8}
382.~.~.~ Focusing

DEFINITION

Classification: 313/382

(under subclass 373) Subject matter including structure to focus the electron beam.

SEE OR SEARCH THIS CLASS, SUBCLASS:

389, for similar structure including a photo-conductive element.

414, for plural beam generators with a focusing electrode.

442, for cathode-ray tubes with magnetic focus.