DIFF Main Group
H01J 40/00 Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence)
Introduced: January 1980
Title
Titles differ between systems:
IPC: Photoelectric discharge tubes not involving the ionisation of a gas
CPC: Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence)
Full Title
Full titles differ between systems:
IPC:
Photoelectric discharge tubes not involving the ionisation of a gas
CPC:
Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- H01J 40/16 having photo- emissive cathode, e.g. alkaline photoelectric cell (operating with secondary emission H01J43/00) since 1980 IPC+CPC Available in IPC and CPC