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DIFF Subgroup
C02F 11/121

by mechanical de-watering

Introduced: January 2019

Full Title

Treatment of sludge; Devices therefor > by de-watering, drying or thickening > by mechanical de-watering

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2019.

Child Classifications

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  • C02F 11/122 using filter presses (C02F11/123 takes precedence) since 2019 IPC+CPC Available in IPC and CPC
  • C02F 11/123 using belt or band filters since 2019 IPC+CPC Available in IPC and CPC
  • C02F 11/125 using screw filters since 2019 IPC+CPC Available in IPC and CPC
  • C02F 11/126 using drum filters since 2019 IPC+CPC Available in IPC and CPC
  • C02F 11/127 by centrifugation since 2019 IPC+CPC Available in IPC and CPC
  • C02F 11/128 using batch processes since 2019 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C02,2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 3,734
  2. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,761
  3. MIDEA 1,938
  4. TONGJI UNIVERSITY 1,433
  5. HARBIN INSTITUTE OF TECHNOLOGY 1,380
  6. HOHAI UNIVERSITY 1,367
  7. BEIJING UNIVERSITY OF TECHNOLOGY 1,317
  8. CHANGZHOU UNIVERSITY 1,248
  9. ZHEJIANG UNIVERSITY 1,229
  10. SOUTH CHINA UNIVERSITY OF TECHNOLOGY 1,203

Top Applicants (CPC)

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