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DIFF Subgroup
G21C 9/02

Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; (control elements per se G21C7/00)

Introduced: September 1968

Title

Titles differ between systems:

IPC: Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse

CPC: Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; (control elements per se G21C7/00)

Full Title

Full titles differ between systems:

IPC:

Emergency protection arrangements structurally associated with the reactor > Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse

CPC:

Emergency protection arrangements structurally associated with the reactor (emergency cooling arrangements G21C15/18) > Means for effecting very rapid reduction of the reactivity factor under fault conditions, e.g. reactor fuse; (control elements per se G21C7/00)

Of 4 combined children, 2 exist in both systems.

2 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

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  • G21C 9/022 CPC only CPC only
  • G21C 9/024 CPC only CPC only
  • G21C 9/027 by fast movement of a solid, e.g. pebbles since 1990 IPC+CPC Available in IPC and CPC
  • G21C 9/033 by an absorbent fluid since 1990 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