DIFF Subgroup
C02F 1/46 by electrochemical methods
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Treatment of water, waste water, or sewage > by electrochemical methods
CPC:
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by electrochemical methods
CPC subdivides this area 3x more granularly than IPC with 4 additional codes.
4 codes are CPC-only extensions.
IPC defines codes here since 1990.
Child Classifications
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- C02F 1/469 by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis since 1990 +4 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class C02,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 3,734
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,761
- MIDEA 1,938
- TONGJI UNIVERSITY 1,433
- HARBIN INSTITUTE OF TECHNOLOGY 1,380
- HOHAI UNIVERSITY 1,367
- BEIJING UNIVERSITY OF TECHNOLOGY 1,317
- CHANGZHOU UNIVERSITY 1,248
- ZHEJIANG UNIVERSITY 1,229
- SOUTH CHINA UNIVERSITY OF TECHNOLOGY 1,203
Top Applicants (CPC)
Class C02,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 2,531
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 1,700
- KURITA WATER IND JP 1,287
- TONGJI UNIVERSITY 1,040
- CHANGZHOU UNIVERSITY 928
- ECOLAB US 904
- HARBIN INSTITUTE OF TECHNOLOGY 904
- BEIJING UNIVERSITY OF TECHNOLOGY 878
- HOHAI UNIVERSITY 862
- EVOQUA WATER TECHNOLOGIES US 842