IPC Subgroup
H01J 1/15 Cathodes heated directly by an electric current
Introduced: September 1968
Last revised: January 2006
Full Title
Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps > Main electrodes > Solid thermionic cathodes > Cathodes heated directly by an electric current
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
Related Keywords
FILAMENTS for discharge tubes
2 direct subcodes
Child Classifications
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