IPC Subgroup
H01J 41/02 Discharge tubes and means integral therewith for measuring gas pressure
Introduced: July 1974
Last revised: January 2006
Full Title
Discharge tubes and means integral therewith for measuring gas pressure; Discharge tubes for evacuation by diffusion of ions > Discharge tubes and means integral therewith for measuring gas pressure
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
4 direct subcodes
Child Classifications
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- H01J 41/04 with ionisation by means of thermionic cathodes
- H01J 41/06 with ionisation by means of cold cathodes
- H01J 41/08 with ionisation by means of radioactive substances, e.g. alphatrons
- H01J 41/1 of particle-spectrometer type