IPC Main Group
G21K 1/00 Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
Introduced: September 1968
Last revised: January 2026
Classification Context
- Section:
- PHYSICS
- Class:
- NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- Subclass:
- HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
Filing statistics
IPC G21K 1/00 belongs to the parent subclass G21K, which recorded 11,603 patent applications worldwide between 2013 and 2023. Annual filings declined from 1,350 in 2013 to 867 in 2023 (-36%). 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
Related Keywords
moderating of NEUTRON(S)
8 direct subcodes
Child Classifications
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- G21K 1/02 using diaphragms, collimators
- G21K 1/06 using diffraction, refraction, or reflection, e.g. monochromators
- G21K 1/08 Deviation, concentration, or focusing of the beam by electric or magnetic means
- G21K 1/1 Scattering devices; Absorbing devices
- G21K 1/14 using charge exchange devices, e.g. for neutralising or changing the sign of the electrical charges of beams
- G21K 1/16 using polarising devices, e.g. for obtaining a polarised ion beam
- G21K 1/2 for confining charged particles or handling confined charged particles, e.g. ion traps
- G21K 1/3 for confining neutral particles or handling confined neutral particles, e.g. atom traps
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