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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
H01J 1/20

Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps > Main electrodes > Solid thermionic cathodes > Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

CPC:

Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps (details of electron-optical or ion-optical arrangements H01J3/00) > Main electrodes > Solid thermionic cathodes > Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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  • H01J 1/22 Heaters IPC+CPC Available in IPC and CPC
  • H01J 1/24 Insulating layer or body located between heater and emissive material IPC+CPC Available in IPC and CPC
  • H01J 1/26 Supports for the emissive material IPC+CPC Available in IPC and CPC
  • H01J 1/28 Dispenser-type cathodes, e.g. L-cathode IPC+CPC Available in IPC and CPC