CPC Main Group
C22B 9/00 General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
Filing statistics
CPC C22B 9/00 belongs to the parent subclass C22B, which recorded 61,160 patent applications worldwide between 2013 and 2023. Annual filings grew from 3,111 in 2013 to 8,089 in 2023 (+160%). The most active applicants in class C22 are JFE STEEL (7,620 applications), NIPPON STEEL CORPORATION (5,769 applications) and POSCO (POHANG IRON AND STEEL COMPANY) (4,523 applications).
Source: EPO PATSTAT, worldwide filings
8 direct subcodes
Child Classifications
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- C22B 9/02 Refining by liquating, filtering, centrifuging, distilling, or supersonic wave action
- C22B 9/04 Refining by applying a vacuum
- C22B 9/05 Refining by treating with gases, e.g. gas flushing
- C22B 9/10 with refining or fluxing agents; Use of materials therefor, (C22B9/18 takes precedence)
- C22B 9/14 Refining in the solid state
- C22B 9/16 Remelting metals (liquating C22B9/02)
Top Applicants
Top 10 applicants by patent filingsfor class C22, 2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 7,620
- NIPPON STEEL CORPORATION JP 5,769
- POSCO (POHANG IRON AND STEEL COMPANY) KR 4,523
- JFE STEEL 3,080
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,999
- ARCELORMITTAL LU 2,962
- CENTRAL SOUTH UNIVERSITY 2,431
- KOBE STEEL JP 2,100
- CHINESE ACADEMY OF SCIENCES 2,052
- MITSUBISHI MATERIALS CORPORATION JP 1,405