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IPC Subgroup
C22C 1/057

with formation of phases other than hard compounds by solid state reaction sintering, e.g. metal phase formed by reduction reaction

Introduced: January 2023

Full Title

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 > with formation of phases other than hard compounds by solid state reaction sintering, e.g. metal phase formed by reduction reaction

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
Subclass:
ALLOYS

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