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CPC Subgroup
H01J 19/06

characterised by the material

Full Title

Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the material

4 direct subcodes

Child Classifications

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  • H01J 19/062 with alkaline-earth metal oxides, or such oxides used in conjunction with reducing agents, as an emissive material
  • H01J 19/064 with other metal oxides as an emissive material
  • H01J 19/066 with metals or alloys as an emissive material
  • H01J 19/068 with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material