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DIFF Main Group
G21H 1/00

Arrangements for obtaining electrical energy from radioactive sources, e.g. from radioactive isotopes

Introduced: September 1968

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G21H 1/02 Cells charged directly by beta radiation IPC+CPC Available in IPC and CPC
  • G21H 1/04 Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation IPC+CPC Available in IPC and CPC
  • G21H 1/06 Cells wherein radiation is applied to the junction of different semiconductor materials IPC+CPC Available in IPC and CPC
  • G21H 1/08 Cells in which radiation ionises a gas in the presence of a junction of two dissimilar metals, i.e. contact potential difference cells IPC+CPC Available in IPC and CPC
  • G21H 1/12 Cells using conversion of the radiation into light combined with subsequent photoelectric conversion into electric energy IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class G21,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINA GENERAL NUCLEAR POWER CORPORATION 2,364
  2. CGN POWER COMPANY 1,899
  3. CHINA NUCLEAR POWER ENGINEERING COMPANY 1,870
  4. NUCLEAR POWER INSTITUTE OF CHINA 1,517
  5. KOREA ATOMIC ENERGY RESEARCH INSTITUTE KR 1,367
  6. WESTINGHOUSE ELECTRIC CORPORATION US 1,295
  7. KOREA HYDRO & NUCLEAR POWER COMPANY KR 1,196
  8. CHINESE ACADEMY OF SCIENCES 1,044
  9. CHINA INSTITUTE OF ATOMIC ENERGY 1,011
  10. HITACHI-GE NUCLEAR ENERGY 955

Top Applicants (CPC)

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