IPC Subgroup
H01J 21/02 Tubes with a single discharge path
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum tubes > Tubes with a single discharge path
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
3 direct subcodes
Child Classifications
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- H01J 21/04 without control means, i.e. diodes
- H01J 21/06 having electrostatic control means only
- H01J 21/18 having magnetic control means; having both magnetic and electrostatic control means