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IPC Subgroup
G21G 4/06

characterised by constructional features

Introduced: July 1974

Last revised: January 2006

Full Title

Radioactive sources > Radioactive sources other than neutron sources > characterised by constructional features

Classification Context

Section:
PHYSICS
Class:
NUCLEAR PHYSICS; NUCLEAR ENGINEERING
Subclass:
CONVERSION OF CHEMICAL ELEMENTS; RADIOACTIVE SOURCES

Filing statistics

IPC G21G 4/06 belongs to the parent subclass G21G, which recorded 4,076 patent applications worldwide between 2013 and 2023. Annual filings grew from 307 in 2013 to 396 in 2023 (+29%), peaking at 431 applications in 2019. 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

1 direct subcode

Child Classifications

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  • G21G 4/08 specially adapted for medical applications

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