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CPC Main Group Additional Only
C02F 2305/00

Use of specific compounds during water treatment

Filing statistics

CPC C02F 2305/00 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

7 direct subcodes

Child Classifications

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  • C02F 2305/04 Surfactants, used as part of a formulation or alone
  • C02F 2305/06 Nutrients for stimulating the growth of microorganisms
  • C02F 2305/08 Nanoparticles or nanotubes
  • C02F 2305/10 Photocatalysts
  • C02F 2305/12 Inert solids used as ballast for improving sedimentation (C02F3/1226 takes precedence)
  • C02F 2305/14 Additives which dissolves or releases substances when predefined environmental conditions are reached, e.g. pH or temperature

Top Applicants

Top 10 applicants by patent filingsfor class C02, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 2,531
  2. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 1,700
  3. KURITA WATER IND JP 1,287
  4. TONGJI UNIVERSITY 1,040
  5. CHANGZHOU UNIVERSITY 928
  6. ECOLAB US 904
  7. HARBIN INSTITUTE OF TECHNOLOGY 904
  8. BEIJING UNIVERSITY OF TECHNOLOGY 878
  9. HOHAI UNIVERSITY 862
  10. EVOQUA WATER TECHNOLOGIES US 842