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IPC Main Group
C22B 4/00

Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys

Introduced: July 1974

Last revised: January 2006

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

Related Keywords

electrothermal processesproducing or refining NON-FERROUS alloys by electrothermal processesproducing or refining NON-FERROUS metals by electrothermal processestreating ORES to obtain other metals, alloys or compounds by electrothermal treatment

4 direct subcodes

Child Classifications

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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