IPC Subgroup
H01J 23/04 Cathodes
Introduced: September 1968
Last revised: January 2006
Full Title
Details of transit-time tubes of the types covered by group > Electrodes; Magnetic control means; Screens > Cathodes
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
1 direct subcode
Child Classifications
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- H01J 23/05 having a cylindrical emissive surface, e.g. cathodes for magnetrons