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CPC Subgroup
C02F 11/14

with addition of chemical agents

Full Title

Treatment of sludge; Devices therefor > by de-watering, drying or thickening > with addition of chemical agents

3 direct subcodes

Child Classifications

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  • C02F 11/147 using organic substances (C02F11/148 takes precedence)
  • C02F 11/148 Combined use of inorganic and organic substances, being added in the same treatment step

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