CPC Main Group
C02F 11/00 Treatment of sludge; Devices therefor
Filing statistics
CPC C02F 11/00 belongs to the parent subclass C02F, which recorded 316,465 patent applications worldwide between 2013 and 2023. Annual filings grew from 12,795 in 2013 to 28,600 in 2023 (+124%), peaking at 39,882 applications in 2018. The most active applicants in class C02 are CHINESE ACADEMY OF SCIENCES (2,531 applications), SINOPEC (CHINA PETROCHEMICAL CORPORATION) (1,700 applications) and KURITA WATER IND (1,287 applications).
Source: EPO PATSTAT, worldwide filings
9 direct subcodes
Child Classifications
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- C02F 11/02 Biological treatment
- C02F 11/06 by oxidation (incinerators for burning waste liquors, e.g. sulfite liquor from paper-making plant F23G7/04)
- C02F 11/10 by pyrolysis
- C02F 11/12 by de-watering, drying or thickening
- C02F 11/18 by thermal conditioning (by pyrolysis C02F11/10)
Top Applicants
Top 10 applicants by patent filingsfor 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