IPC Subgroup
H01J 19/06 characterised by the material
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the material
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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