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PCE
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DIFF Subgroup
H01J 19/06

characterised by the material

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 > characterised by the material

CPC:

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

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

IPC defines codes here since 1995.

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 since 1995 IPC+CPC Available in IPC and CPC
  • H01J 19/064 with other metal oxides as an emissive material since 1995 IPC+CPC Available in IPC and CPC
  • H01J 19/066 with metals or alloys as an emissive material since 1995 IPC+CPC Available in IPC and CPC
  • H01J 19/068 with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material since 1995 IPC+CPC Available in IPC and CPC