(under subclass 567) Subject matter wherein the electrode is a cathode and the cathode is heated by the passage of electrical current through it or indirectly heated by the passage of an electrical current through a resistive element.
(1) Note. For a gas or vapor discharge device having an electrode heated by a space discharge current, see subclasses 627+.
(2) Note. Subclass 616 includes a cathode shield and a heated electrode where the heated electrode when negative is the cathode and the shield is used to prevent positive ion bombardment of the electrode.
SEE OR SEARCH THIS CLASS, SUBCLASS:
37+, for a lamp or discharge device with a temperature modifier for a heated cathode.
310, for other discharge devices which have a directly heated cathode or an indirectly heated cathode.
337+, for an indirectly heated cathode, per se.
341+, for a resistance heated cathode, per se. 591+, for three or more electrode gas or vapor discharge device having a heated cathode.
616, for a positive ion or cathode electrode shield.
627+, for an electrode heated by space discharge current.
SEE OR SEARCH CLASS
315, Electric Lamp and Discharge Devices: Systems,
94+, for systems for supplying electrical energy to the
