(under subclass 581) Subject matter which includes, (1) a cathode and an anode between which the main electron flow takes place after the gas or vapor ionizes and a control electrode which does not lose control of the electron flow between the cathode and the anode after the gas or vapor ionizes, (2) an auxiliary cathode and an anode with the gas or vapor in between which functions, when the appropriate voltage is placed on the auxiliary cathode and the anode, to ionize the gas or the vapor to create electrons which form the electron current in the envelope, or (3) an auxillary cathode and an auxillary anode which causes the gas or vapor to ionize, when the appropriate voltage is placed between them and cause the electrons formed by the ionization to bombard the auxillary anode which in turn gives off secondary electrons which acts as the main cathode of the device.
(1) Note. See the glossary for the terms "cathanode" and "ionic cathanode".
(2) Note. Some the discharge device in this subclass are provided with means, such as a barrier, between two discharge spaces, so that different pressures of gas or different kinds of gas may be maintained in the respective discharge space, the barrier being electron permeable. Other of the discharge spaces have the electron receiving electrode so spaced with respect to the ionizing discharge electrodes that the electrons do not attain sufficient velocity or do not travel through sufficiently long distance to ionize the gas or vapor.
SEE OR SEARCH THIS CLASS, SUBCLASS:
305, for cathanode type discharge device which is provided with two electron emissive electrodes and another electrode, one electron emissive electrode being designed to emit electrons to the second electron emitting electrode to heat the second emitting electrode to its emitting temperature, the second emitting electrode being designed to emit electrons to the third electrode.
359.1+, for discharge devices with means to form and accelerate positive ion or megative ions.
420, for a cathode-ray tube which is provided with a electron permeable window.
598, for a gas or vapor discharge device with three or more electrodes one of which is an apertured grid, the space between two of the electrodes is less than the mean free path spacing of the gas or vapor.
SEE OR SEARCH CLASS
330, Amplifiers,
4+, for maser type amplifying devices and subclass 41 for gas or vapor type amplifying device.
