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CPC Subgroup
G21H 1/04

Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation

Full Title

Arrangements for obtaining electrical energy from radioactive sources, e.g. from radioactive isotopes > Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation

Filing statistics

CPC G21H 1/04 belongs to the parent subclass G21H, which recorded 1,260 patent applications worldwide between 2013 and 2023. Annual filings grew from 76 in 2013 to 117 in 2023 (+54%), peaking at 157 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

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