US PATENT SUBCLASS 313 / 450
.~.~.~.~.~.~ With coating or spiral electrode

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

364  DF  CATHODE RAY TUBE {11}
441  DF  .~ Ray generating or control {6}
446  DF  .~.~ Including cathode assembly {2}
447  DF  .~.~.~ With control grid adjacent cathode {1}
448  DF  .~.~.~.~ With anode {1}
449  DF  .~.~.~.~.~ With additional electrode {2}
450.~.~.~.~.~.~ With coating or spiral electrode

DEFINITION

Classification: 313/450

(under subclass 449) Subject matter wherein the additional electrode is a conductive coating on the envelope wall or is a conductive helical wire.