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PCE
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DIFF Subgroup
C22B 3/24

by adsorption on solid substances, e.g. by extraction with solid resins

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Extraction of metal compounds from ores or concentrates by wet processes > Treatment or purification of solutions, e.g. obtained by leaching > by physical processes, e.g. by filtration, by magnetic means > by adsorption on solid substances, e.g. by extraction with solid resins

CPC:

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) > by physical processes, e.g. by filtration, by magnetic means (treatment or purification of solutions by liquid-liquid extraction C22B3/26) > by adsorption on solid substances, e.g. by extraction with solid resins

No child classifications to compare. This is a leaf node in both 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