US PATENT SUBCLASS 313 / 389
.~.~.~ 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}
384  DF  .~.~ Photoconductive {5}
389.~.~.~ Focusing

DEFINITION

Classification: 313/389

(under subclass 384) Subject matter including structure to focus the cathode ray.

SEE OR SEARCH THIS CLASS, SUBCLASS:

382, for similar structure including a photo-emissive cathode.

414, for plural beam generator with a focusing electrode.

442, for cathode-ray tubes with magnetic focus.