(under subclass 58) Processes for coating processes which result in an electrical product which functions to emit or suppress emission of electrons into space.
(1) Note. This subclass provides for applying alkaline earth compound coatings on directly or indirectly heated cathodes or filaments for thermionic tubes, etc.
(2) Note. This subclass does not provide for producing products which emit electrons by arcing. For arcing or sparking see subclass 580.
SEE OR SEARCH THIS CLASS, SUBCLASS:
59+, for processes which result in welding electrodes.
74+, for processes which result in a photo-emissive electrical product.
