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IPC Subgroup
G21C 3/34

Spacer grids

Introduced: September 1968

Last revised: January 2006

Full Title

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

Classification Context

Section:
PHYSICS
Class:
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
Subclass:
NUCLEAR REACTORS

4 direct subcodes

Child Classifications

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  • G21C 3/344 formed of assembled tubular elements
  • G21C 3/348 formed of assembled non-intersecting strips
  • G21C 3/352 formed of assembled intersecting strips
  • G21C 3/356 being provided with fuel element supporting members

Top Applicants

Top 10 applicants by patent filingsfor 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