by mechanical de-watering

Introduced: January 2019

Full Title

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

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 11/121 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

6 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

C02F 11/122 using filter presses
C02F 11/123 using belt or band filters
C02F 11/125 using screw filters
C02F 11/126 using drum filters
C02F 11/127 by centrifugation
C02F 11/128 using batch processes

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