IPC Subgroup
H01J 19/066 with metals or alloys as an emissive material
Introduced: January 1995
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 > with metals or alloys as an emissive material
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS