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IPC Main Group
C02F 3/00

Biological treatment of water, waste water, or sewage

Introduced: January 1980

Last revised: January 2023

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
Subclass:
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

Related Keywords

purifying SEWAGE biologically

5 direct subcodes

Child Classifications

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  • C02F 3/28 Anaerobic digestion processes
  • C02F 3/3 Aerobic and anaerobic processes
  • C02F 3/32 characterised by the animals or plants used, e.g. algae
  • C02F 3/34 characterised by the microorganisms used

Top Applicants

Top 10 applicants by patent filingsfor 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