DIFF Subgroup
H01J 17/06 Cathodes
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Gas-filled discharge tubes with solid cathodes > Details > Electrodes; Screens > Cathodes
CPC:
Gas-filled discharge tubes with solid cathode (H01J25/00, H01J27/00, H01J31/00 - H01J41/00 take precedence; gas filled spark gaps H01T; Marx converters H02M7/26) > Details > Electrodes; Screens > Cathodes
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
Child Classifications
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- H01J 17/08 having mercury or liquid alkali metal deposited on the cathode surface during operation of the tube IPC+CPC Available in IPC and CPC