IPC Main Group
G21C 17/00 Monitoring; Testing
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- Subclass:
- NUCLEAR REACTORS
Filing statistics
IPC G21C 17/00 belongs to the parent subclass G21C, which recorded 29,798 patent applications worldwide between 2013 and 2023. Annual filings declined from 2,773 in 2013 to 2,661 in 2023 (-4%), peaking at 3,001 applications in 2021. The most active applicants in class G21 are CHINA GENERAL NUCLEAR POWER CORPORATION (2,364 applications), CGN POWER COMPANY (1,899 applications) and CHINA NUCLEAR POWER ENGINEERING COMPANY (1,870 applications).
Source: EPO PATSTAT, worldwide filings
7 direct subcodes
Child Classifications
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- G21C 17/003 Remote inspection of vessels, e.g. pressure vessels
- G21C 17/017 Inspection or maintenance of pipe-lines or tubes in nuclear installations
- G21C 17/02 Devices or arrangements for monitoring coolant or moderator
- G21C 17/06 Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
- G21C 17/08 Structural combination of reactor core or moderator structure with viewing means, e.g. with television camera, periscope, window
- G21C 17/1 Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C 17/14 Period meters
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