by liquid-liquid extraction using organic compounds

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 liquid-liquid extraction using organic compounds

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 liquid-liquid extraction using organic compounds

Of 13 combined children, 7 exist in both systems.

6 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1990.

Child Classifications

Navigate with arrow keys, Enter to open

C22B 3/262 CPC only CPC only
C22B 3/28 Amines since 1990 +4 CPC IPC+CPC Available in IPC and CPC
C22B 3/30 Oximes since 1990 IPC+CPC Available in IPC and CPC
C22B 3/302 +1 CPC CPC only CPC only
C22B 3/306 CPC only CPC only
C22B 3/32 Carboxylic acids since 1990 +3 CPC IPC+CPC Available in IPC and CPC
C22B 3/33 CPC only CPC only
C22B 3/34 containing sulfur since 1990 IPC+CPC Available in IPC and CPC
C22B 3/36 Heterocyclic compounds (C22B3/34 takes precedence) since 1990 +1 CPC IPC+CPC Available in IPC and CPC
C22B 3/37 CPC only CPC only
C22B 3/38 containing phosphorus since 1990 +7 CPC IPC+CPC Available in IPC and CPC
C22B 3/40 Mixtures since 1990 +4 CPC IPC+CPC Available in IPC and CPC
C22B 3/41 CPC only CPC only

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