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CPC Subgroup
G21D 3/04

Safety arrangements (emergency protection of reactor G21C9/00)

Full Title

Control of nuclear power plant (control of nuclear reaction in general G21C7/00) > Safety arrangements (emergency protection of reactor G21C9/00)

Filing statistics

CPC G21D 3/04 belongs to the parent subclass G21D, which recorded 7,355 patent applications worldwide between 2013 and 2023. Annual filings grew from 666 in 2013 to 782 in 2023 (+17%), peaking at 866 applications in 2021. The most active applicants in class G21 are CHINA GENERAL NUCLEAR POWER CORPORATION (1,383 applications), WESTINGHOUSE ELECTRIC CORPORATION (1,347 applications) and KOREA ATOMIC ENERGY RESEARCH INSTITUTE (1,303 applications).

Source: EPO PATSTAT, worldwide filings

1 direct subcode

Child Classifications

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  • G21D 3/06 responsive to faults within the plant (in the reactor G21C9/00)

Top Applicants

Top 10 applicants by patent filingsfor class G21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINA GENERAL NUCLEAR POWER CORPORATION 1,383
  2. WESTINGHOUSE ELECTRIC CORPORATION US 1,347
  3. KOREA ATOMIC ENERGY RESEARCH INSTITUTE KR 1,303
  4. CGN POWER COMPANY 1,156
  5. CHINA NUCLEAR POWER ENGINEERING COMPANY 1,149
  6. KOREA HYDRO & NUCLEAR POWER COMPANY KR 1,146
  7. NUCLEAR POWER INSTITUTE OF CHINA 1,086
  8. CHINESE ACADEMY OF SCIENCES 765
  9. CEA (COMMISSARIAT A L'ENERGIE ATOMIQUE) FR 763
  10. CHINA INSTITUTE OF ATOMIC ENERGY 659