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DIFF Main Group
G21C 15/00

Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants

Introduced: September 1968

IPC and CPC are identically structured here. All 7 subcodes exist in both systems.

6 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G21C 15/16 comprising means for separating liquid and steam (separating in general B01D; steam traps F16D) IPC+CPC Available in IPC and CPC
  • G21C 15/20 Partitions or thermal insulation between fuel channel and moderator IPC+CPC Available in IPC and CPC
  • G21C 15/22 Structural association of coolant tubes with headers (joints of tubes in general F16L) IPC+CPC Available in IPC and CPC
  • G21C 15/28 Selection of specific coolants (if serving as the moderator G21C5/12; compositions per se C09K5/00; ); 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