IPC Subgroup
C02F 11/12 by de-watering, drying or thickening
Introduced: January 1980
Last revised: January 2019
Full Title
Treatment of sludge; Devices therefor > by de-watering, drying or thickening
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
drying or dewatering SEWAGE sludge
5 direct subcodes
Child Classifications
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- C02F 11/121 by mechanical de-watering
- C02F 11/13 by heating
- C02F 11/14 with addition of chemical agents
- C02F 11/15 by treatment with electric, magnetic or electromagnetic fields; by treatment with ultrasonic waves
- C02F 11/16 using drying or composting beds
Top Applicants
Top 10 applicants by patent filingsfor class C02, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 3,734
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,761
- MIDEA 1,938
- TONGJI UNIVERSITY 1,433
- HARBIN INSTITUTE OF TECHNOLOGY 1,380
- HOHAI UNIVERSITY 1,367
- BEIJING UNIVERSITY OF TECHNOLOGY 1,317
- CHANGZHOU UNIVERSITY 1,248
- ZHEJIANG UNIVERSITY 1,229
- SOUTH CHINA UNIVERSITY OF TECHNOLOGY 1,203