IPC Main Group
G21C 7/00 Control of nuclear reaction
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- Subclass:
- NUCLEAR REACTORS
Related Keywords
CONTROL(S) devices in nuclear reactors, e.g. control rodsCONTROLLING of reactivity in nuclear reactorscontrolling FLUX in nuclear reactors
8 direct subcodes
Child Classifications
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- G21C 7/02 by using self-regulating properties of reactor materials
- G21C 7/06 by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
- G21C 7/26 by displacement of the moderator or parts thereof
- G21C 7/28 by displacement of the reflector or parts thereof
- G21C 7/3 by displacement of reactor fuel or fuel elements
- G21C 7/32 by varying flow of coolant through the core
- G21C 7/34 by utilisation of a primary neutron source
- G21C 7/36 Control circuits
Top Applicants
Top 10 applicants by patent filingsfor class G21, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINA GENERAL NUCLEAR POWER CORPORATION 2,364
- CGN POWER COMPANY 1,899
- CHINA NUCLEAR POWER ENGINEERING COMPANY 1,870
- NUCLEAR POWER INSTITUTE OF CHINA 1,517
- KOREA ATOMIC ENERGY RESEARCH INSTITUTE KR 1,367
- WESTINGHOUSE ELECTRIC CORPORATION US 1,295
- KOREA HYDRO & NUCLEAR POWER COMPANY KR 1,196
- CHINESE ACADEMY OF SCIENCES 1,044
- CHINA INSTITUTE OF ATOMIC ENERGY 1,011
- HITACHI-GE NUCLEAR ENERGY 955