DIFF Subgroup
C02F 1/74 with air (aeration of stretches of water C02F7/00)
Introduced: January 1980
Title
Titles differ between systems:
IPC: with air
CPC: with air (aeration of stretches of water C02F7/00)
Full Title
Full titles differ between systems:
IPC:
Treatment of water, waste water, or sewage > by oxidation > with air
CPC:
Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) > by oxidation > with air (aeration of stretches of water C02F7/00)
No child classifications to compare. This is a leaf node in both 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