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

Filing statistics

IPC C02F 11/12 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

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