IPC Subgroup
H01J 23/08 Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
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 > Focusing arrangements, e.g. for concentrating stream of electrons, for preventing spreading of stream
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
2 direct subcodes
Child Classifications
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- H01J 23/083 Electrostatic focusing arrangements
- H01J 23/087 Magnetic focusing arrangements