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IPC Subgroup
C22B 5/2

from metal carbonyls

Introduced: September 1968

Last revised: January 2006

Full Title

General processes of reducing to metals > Dry processes > from metal carbonyls

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
Subclass:
PRODUCTION OR REFINING OF METALS; PRETREATMENT OF RAW MATERIALS

Filing statistics

IPC C22B 5/2 belongs to the parent subclass C22B, which recorded 85,461 patent applications worldwide between 2013 and 2023. Annual filings grew from 6,202 in 2013 to 10,457 in 2023 (+69%). The most active applicants in class C22 are JFE STEEL (7,152 applications), NIPPON STEEL CORPORATION (5,416 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (4,530 applications).

Source: EPO PATSTAT, worldwide filings

Top Applicants

Top 10 applicants by patent filingsfor class C22, 2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 7,152
  2. NIPPON STEEL CORPORATION JP 5,416
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,530
  4. JFE STEEL 3,986
  5. CENTRAL SOUTH UNIVERSITY 3,086
  6. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,843
  7. CHINESE ACADEMY OF SCIENCES 2,702
  8. ARCELORMITTAL LU 2,124
  9. NSSMC (NIPPON STEEL & SUMITOMO METAL) 2,075
  10. KOBE STEEL JP 1,891