(under subclass 525) Subject matter which includes between the photoemissive cathode and the phosphor screen an electrical element to control the photoemissive electrons emitted by the cathode.
SEE OR SEARCH THIS CLASS, SUBCLASS:
103+, for a secondary emitter type lamp or discharge devices.
399+, for a cathode-ray tube with a secondary emissive electrode.
532+, for a photosensitive lamp or discharge device having a secondary electron emissive electrode.
SEE OR SEARCH CLASS
250, Radiant Energy,
207, for a photocell controlled circuit having a secondary emissive electron multiplier. 329, Demodulators and Detectors,
148+, for a demodulator and detector with secondary emission.
330, Amplifiers,
42, for an amplifier with secondary electron emission tube amplifying device.
