US PATENT SUBCLASS 313 / 544
.~.~ With envelope

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

523  DF  PHOTOSENSITIVE {12}
542  DF  .~ Photocathode {2}
544.~.~ With envelope

DEFINITION

Classification: 313/544

With envelope:

(under subclass 543) Subject matter which includes a container generally to enclose the photocathode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

364+, for an image pickup tube with a photoemissive cathode.

532+, for a photomultiplier which includes a photoemissive cathode within an envelope.

538, for a gas or vapor phototube which includes a photoemissive cathode within an envelope.

541, for a phototube having a photocathode on the tube wall.