US PATENT SUBCLASS 313 / 375
.~.~.~ Plural photoemissive layers

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}
375.~.~.~ Plural photoemissive layers

DEFINITION

Classification: 313/375

(under subclass 373) Subject matter wherein the photo-emissive cathode is in the form of more than one film, coating or layer on a substrate each being photo-emissive.