(under subclass 542) Subject matter which includes a phosphor screen which is, (1) responsive to electromagnetic radiation to change the frequency of the electromagnetic radiation to electromagnetic energy to which the photoemissive electrode is responsive to emit photoemissive electrons from its surface, or (2) responsive to the photoemissive electrons emitted by the photoemissive electrode as a result of the bombardment by the electromagnetic radiation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
483+, for a lamp or discharge device with a luminescent solid or liquid material.
525+, for a lamp or discharge device of the photosensitive type having a phosphor screen responsive to a photocathode or a photocathode responsive to a phosphor screen.
