.~ Having electrode of alkali, alkaline or rare earth material
DEFINITION
Classification: 313/630
Having electrode of alkali, alkaline or rare earth material:
(under subclass 567) Subject matter wherein the electrode includes within the envelope, structure or a material containing an alkali, alkaline or a rare earth as an element or in compound form.
(1) Note. If composite electrode structure is an electron emissive material coated or laminated electrode, see subclass 631.
(2) Note. See the "SEARCH THIS CLASS, SUBCLASS" notes in subclass 631.
SEE OR SEARCH THIS CLASS, SUBCLASS:
326+, for a discharge device electrode, particularly subclasses 337+ for a indirectly heated cathode, subclasses 341+ for a resistance heated cathode and 346 for cathode containing and/or coated with an electron emissive material.
591+, for a three or more electrode gas or vapor discharge device having a cathode heater.
618, for a gas or vapor discharge device having a hollow cathode.
631, for an electron emissive coated or laminated electrode. 636+, for a gas or vapor discharge device having an electrode heated by space discharge current.
639, for a space discharge device having a resistance heated cathode.
