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IPC Subgroup
G21C 7/1

Construction of control elements

Introduced: September 1968

Last revised: January 2006

Full Title

Control of nuclear reaction > by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section > by displacement of solid control elements, e.g. control rods > Construction of control elements

Classification Context

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

5 direct subcodes

Child Classifications

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  • G21C 7/103 Control assemblies containing one or more absorbants as well as other elements, e.g. fuel or moderator elements
  • G21C 7/107 Control elements adapted for pebble-bed reactors
  • G21C 7/11 Deformable control elements, e.g. flexible, telescopic, articulated
  • G21C 7/113 Control elements made of flat elements; Control elements having cruciform cross-section
  • G21C 7/117 Clusters of control rods; Spider construction

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