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DIFF Subgroup
C22C 1/051

Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor

Introduced: January 2023

Full Title

Full titles differ between systems:

IPC:

Making non-ferrous alloys > by powder metallurgy > Mixtures of metal powder with non-metallic powder > Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor

CPC:

Making non-ferrous alloys (by electrothermic methods C22B4/00; by electrolysis C25C1/24, C25C3/36) > by powder metallurgy (C22C1/08 takes precedence) > Mixtures of metal powder with non-metallic powder (C22C1/08 takes precedence) > Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2023.

Child Classifications

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  • C22C 1/057 with in situ formation of phases other than hard compounds by solid state reaction sintering, e.g. metal phase formed by reduction reaction since 2023 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

Class C22,2013–2023, worldwide · Source: EPO PATSTAT

  1. JFE STEEL JP 7,620
  2. NIPPON STEEL CORPORATION JP 5,769
  3. POSCO (POHANG IRON AND STEEL COMPANY) KR 4,523
  4. JFE STEEL 3,080
  5. NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,999
  6. ARCELORMITTAL LU 2,962
  7. CENTRAL SOUTH UNIVERSITY 2,431
  8. KOBE STEEL JP 2,100
  9. CHINESE ACADEMY OF SCIENCES 2,052
  10. MITSUBISHI MATERIALS CORPORATION JP 1,405