US PATENT SUBCLASS 313 / 447
.~.~.~ With control grid adjacent cathode

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.~.~.~ With control grid adjacent cathode {1}
448  DF  .~.~.~.~> With anode {1}

DEFINITION

Classification: 313/447

(under subclass 446) Subject matter including an electrode located immediately adjacent the cathode for regulating the velocity of an electron or electron beam density.