Skip to content
PCE
Search Classifications
Search for IPC and CPC classification codes or keywords
DIFF Subgroup
G21C 3/34

Spacer grids

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Reactor fuel elements or their assemblies; Selection of substances for use as reactor fuel elements > Assemblies of a number of fuel elements in the form of a rigid unit > Bundles of parallel pin-, rod-, or tube-shaped fuel elements > Spacer grids

CPC:

Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements > Assemblies of a number of fuel elements in the form of a rigid unit > Bundles of parallel pin-, rod-, or tube-shaped fuel elements > Spacer grids

Of 8 combined children, 4 exist in both systems.

4 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

Navigate with arrow keys, Enter to open

  • G21C 3/3408 CPC only CPC only
  • G21C 3/3416 CPC only CPC only
  • G21C 3/3424 CPC only CPC only
  • G21C 3/3432 CPC only CPC only
  • G21C 3/344 formed of assembled tubular elements since 1990 IPC+CPC Available in IPC and CPC
  • G21C 3/348 formed of assembled non-intersecting strips since 1990 IPC+CPC Available in IPC and CPC
  • G21C 3/352 formed of assembled intersecting strips 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