IPC Subgroup
H01J 19/28 Non-electron-emitting electrodes; Screens
Introduced: September 1968
Last revised: January 2006
Full Title
Details of vacuum tubes of the types covered by group > Non-electron-emitting electrodes; Screens
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
4 direct subcodes
Child Classifications
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- H01J 19/3 characterised by the material
- H01J 19/32 Anodes
- H01J 19/38 Control electrodes, e.g. grid
- H01J 19/4 Screens for shielding