IPC Subgroup
H01J 17/58 with more than one cathode or anode
Introduced: September 1968
Last revised: January 2006
Full Title
Gas-filled discharge tubes with solid cathodes > Thermionic-cathode tubes > with more than one cathode or anode
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2 direct subcodes
Child Classifications
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- H01J 17/6 the discharge paths priming each other in a predetermined sequence, e.g. counting tube
- H01J 17/62 with independent discharge paths controlled by intermediate electrodes, e.g. polyphase rectifier