Having electrode heated by space discharge current:
(under subclass 567) Subject matter wherein the electrode is bombarded by a charged particle of the ionized gas or vapor which constitutes the electrical discharge within the envelope of the tube which is attracted to the electrode by an electrical force.
(1) Note. The gas or vapor discharge is not restricted to the discharge between the main electrodes of the tube.
(2) Note. All or part of the electrode is of therminonically active material.
(3) Note. The discharge may be from electrons or ions.
SEE OR SEARCH THIS CLASS, SUBCLASS:
39+, for a discharge device with a filament or a heated cathode with means to modify the temperature of the cathode of filament.
310, for a discharge device having a thermionic cathode.
346+, for thermionic electrode, per se, and the notes to the other subclasses and classes. 347, for an electrode which becomes incandescent when subjected to electron bombarment.
558, for a lamp or discharge device with an electrode which includes or is coated with a getter.
566, for a lamp or discharge device with a filament or a heated cathode electrode which includes or is coated with a vapor generating material.
567+, for a gas or vapor discharge device particularly subclasses 591+ for three or more electrode device having a cathode heater.
