US PATENT SUBCLASS 313 / 380
.~.~.~ Special ray sensitive

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}
380.~.~.~ Special ray sensitive

DEFINITION

Classification: 313/380

(under subclass 373) Subject matter wherein the photo-emissive cathode is adapted to respond to electromagnetic radiation other than visible light.

(1) Note. Included here is structure of or associated with the cathode to make it particularly sensitive to, for example, infrared radiation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

388, for photoconductive elements made sensitive to particular frequencies of electromagnetic radiation.