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CPC Subgroup
H01J 1/20

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

Full Title

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

4 direct subcodes

Child Classifications

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

Top Applicants

Top 10 applicants by patent filingsfor class H01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. SAMSUNG ELECTRONICS COMPANY KR 37,897
  2. TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY TW 36,116
  3. APPLIED MATERIALS US 21,640
  4. LG ENERGY SOLUTION KR 20,770
  5. LG CHEM KR 19,835
  6. TOKYO ELECTRON JP 18,519
  7. ROBERT BOSCH DE 14,595
  8. INTEL CORPORATION US 13,580
  9. MURATA MANUFACTURING COMPANY JP 12,151
  10. SAMSUNG SDI COMPANY KR 12,080