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PCE
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DIFF Subgroup
H01J 19/068

with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material

Introduced: January 1995

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 > with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material

CPC:

Details of vacuum tubes of the types covered by group H01J21/00 > Electron-emitting electrodes; Cathodes > Thermionic cathodes > characterised by the material > with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material

No child classifications to compare. This is a leaf node in both IPC and CPC.