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IPC Subgroup
C02F 3/04

using trickle filters

Introduced: January 1980

Last revised: January 2023

Full Title

Biological treatment of water, waste water, or sewage > Aerobic processes > using trickle filters

Classification Context

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

Filing statistics

IPC C02F 3/04 belongs to the parent subclass C02F, which recorded 678,287 patent applications worldwide between 2013 and 2023. Annual filings grew from 28,734 in 2013 to 70,835 in 2023 (+147%), peaking at 91,737 applications in 2020. The most active applicants in class C02 are CHINESE ACADEMY OF SCIENCES (3,734 applications), SINOPEC (CHINA PETROCHEMICAL CORPORATION) (2,761 applications) and MIDEA (1,938 applications).

Source: EPO PATSTAT, worldwide filings

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