(under subclass 523) Subject matter wherein there is an ionizable gas within an envelope and the electrode is photoemissive so that photoelectrons hitting the gas causes the gas to ionize to release additional electrons.
SEE OR SEARCH THIS CLASS, SUBCLASS:
532+, for a vacuum tube photomultiplier.
567+, for a lamp or discharge device having gas or vapor.
SEE OR SEARCH CLASS
250, Radiant Energy,
200+, for a gas phototube circuit or apparatus, subclasses 374+ for invisible radiant energy responsive electric signalling device having a gas responsive to the invisible radiant energy rather than a photocathode.
315, Electric Lamp and Discharge Devices: Systems, 149+, for an electric lamp or discharge device system including a radiant energy sensitive control means.
