CPC Subgroup
C02F 11/121 by mechanical de-watering
Full Title
Treatment of sludge; Devices therefor > by de-watering, drying or thickening > by mechanical de-watering
Filing statistics
CPC C02F 11/121 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
6 direct subcodes
Child Classifications
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- C02F 11/122 using filter presses (C02F11/123 takes precedence)
- C02F 11/123 using belt or band filters
- C02F 11/125 using screw filters
- C02F 11/126 using drum filters
- C02F 11/127 by centrifugation
- C02F 11/128 using batch processes
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