US PATENT SUBCLASS 313 / 471
.~.~.~ Beam indexing element


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

364  DF  CATHODE RAY TUBE {11}
461  DF  .~ Screen {10}
470  DF  .~.~ Mosaic {2}
471.~.~.~ Beam indexing element


DEFINITION

Classification: 313/471

(under subclass 470) Subject matter including a phosphor positioned on the screen which when excited gives an indication of the position of the electron beam.

(1) Note. In operation light from the beam indexing element or elements is generally received by a detector.