Thermionic cathodes

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of vacuum tubes of the types covered by group > Electron-emitting electrodes; Cathodes > Thermionic cathodes

CPC:

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

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

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H01J 19/06 characterised by the material IPC+CPC Available in IPC and CPC
H01J 19/08 Cathodes heated directly by an electric current IPC+CPC Available in IPC and CPC
H01J 19/10 characterised by the shape IPC+CPC Available in IPC and CPC
H01J 19/14 Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment IPC+CPC Available in IPC and CPC