.~.~ Insulating material between heater and cathode
DEFINITION
Classification: 313/340
(under subclass 337) Cathodes which are provided with an electrical insulating material between the cathode member and the heating means for the cathode.
SEE OR SEARCH CLASS
174, Electricity: Conductors and Insulators,
137+, for insulators, note subclass 138 for cathode heater insulators, per se, and subclasses 110+ for insulated electric conductors.
219, Electric Heating,
531, for electric heaters provided with insulating means including the combination of an electrical heater and
insulating means for an indirectly heated cathode where the cathode is not included in the claims. 252, Compositions,
570+, for fluent electrical insulating materials and compositions.
338, Electrical Resistors,
226+, for electrical resistors having a casing or housing around the resistance element.
427, Coating Processes,
58+, for processes of coating, per se, wherein the product is an electrical product.
428, Stock Material or Miscellaneous Articles,
375+, for a filament or electrode for electric lamps and space discharge devices which have an insulting coating thereon.
501, Compositions: Ceramic, appropriate subclasses for ceramic electrical insulating compositions, especially
127+, and 134+ for clay containing compositions; and subclasses 141+ for titanates and similar material containing compositions.
