DIFF Subgroup
H01J 41/14 with ionisation by means of thermionic cathodes
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Discharge tubes and means integral therewith for measuring gas pressure; Discharge tubes for evacuation by diffusion of ions > Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps > with ionisation by means of thermionic cathodes
CPC:
Discharge tubes for measuring pressure of introduced gas ; Discharge tubes for evacuation by diffusion of ions > Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps > with ionisation by means of thermionic cathodes
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1974.
Child Classifications
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