C22B 3/20 Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence)
Introduced: January 1990
Title
Titles differ between systems:
IPC: Treatment or purification of solutions, e.g. obtained by leaching
CPC: Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence)
Full Title
Full titles differ between systems:
Extraction of metal compounds from ores or concentrates by wet processes > Treatment or purification of solutions, e.g. obtained by leaching
Extraction of metal compounds from ores or concentrates by wet processes > Treatment or purification of solutions, e.g. obtained by leaching (C22B3/18 takes precedence)
Of 5 combined children, 4 exist in both systems.
1 codes are CPC-only extensions.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1990.
Child Classifications
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- C22B 3/22 by physical processes, e.g. by filtration, by magnetic means (treatment or purification of solutions by liquid-liquid extraction C22B3/26) since 1990 IPC+CPC Available in IPC and CPC
- C22B 3/26 by liquid-liquid extraction using organic compounds since 1990 +6 CPC IPC+CPC Available in IPC and CPC
- C22B 3/44 by chemical processes (treatment or purification of solutions by liquid-liquid extraction C22B3/26, by ion-exchange extraction C22B3/42) since 1990 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class C22,2013–2023, worldwide · Source: EPO PATSTAT
- JFE STEEL JP 7,152
- NIPPON STEEL CORPORATION JP 5,416
- POSCO (POHANG IRON AND STEEL COMPANY) KR 4,530
- JFE STEEL 3,986
- CENTRAL SOUTH UNIVERSITY 3,086
- NSSMC (NIPPON STEEL & SUMITOMO METAL) JP 2,843
- CHINESE ACADEMY OF SCIENCES 2,702
- ARCELORMITTAL LU 2,124
- NSSMC (NIPPON STEEL & SUMITOMO METAL) 2,075
- KOBE STEEL JP 1,891
Top Applicants (CPC)
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