CPC Main Group
C02F 1/00 Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence)
Filing statistics
CPC C02F 1/00 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
26 direct subcodes
Child Classifications
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- C02F 1/02 by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D)
- C02F 1/20 by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D)
- C02F 1/22 by freezing
- C02F 1/24 by flotation (C02F1/465 takes precedence)
- C02F 1/26 by extraction
- C02F 1/28 by sorption (using ion-exchange C02F1/42; sorbent compositions B01J)
- C02F 1/30 by irradiation
- C02F 1/34 with mechanical oscillations
- C02F 1/38 by centrifugal separation
- C02F 1/40 Devices for separating or removing fatty or oily substances or similar floating material (cleaning or keeping clear the surface of open water from oil or like materials E02B15/04; devices in sewers for separating liquid or solid substances from sewage E03F5/14, e.g. for use in drains leading to the sewer E03F5/16)
- C02F 1/42 by ion-exchange (ion-exchange in general B01J)
- C02F 1/44 by dialysis, osmosis or reverse osmosis
- C02F 1/46 by electrochemical methods
- C02F 1/48 with magnetic or electric fields (C02F1/46 takes precedence)
- C02F 1/50 by addition or application of a germicide or by oligodynamic treatment
- C02F 1/52 by flocculation or precipitation of suspended impurities
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