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CPC Subgroup
H01J 1/30

Cold cathodes, e.g. field-emissive cathode

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 > Cold cathodes, e.g. field-emissive cathode

Filing statistics

CPC H01J 1/30 belongs to the parent subclass H01J, which recorded 135,587 patent applications worldwide between 2013 and 2023. Annual filings grew from 10,933 in 2013 to 11,751 in 2023 (+7%), peaking at 14,583 applications in 2021. The most active applicants in class H01 are SAMSUNG ELECTRONICS COMPANY (37,897 applications), TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY (36,116 applications) and APPLIED MATERIALS (21,640 applications).

Source: EPO PATSTAT, worldwide filings

4 direct subcodes

Child Classifications

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  • H01J 1/308 Semiconductor cathodes, e.g. cathodes with PN junction layers
  • H01J 1/312 having an electric field perpendicular to the surface, e.g. tunnel-effect cathodes of metal-insulator-metal [MIM] type
  • H01J 1/316 having an electric field parallel to the surface, e.g. thin film cathodes

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