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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

Related Keywords

moderating of NEUTRON(S)

8 direct subcodes

Child Classifications

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  • G21K 1/06 using diffraction, refraction, or reflection, e.g. monochromators
  • 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

  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