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

Filing statistics

IPC C02F 1/00 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

21 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

C02F 1/02 by heating
C02F 1/2 by degassing, i.e. liberation of dissolved gases
C02F 1/22 by freezing
C02F 1/24 by flotation
C02F 1/26 by extraction
C02F 1/28 by sorption
C02F 1/3 by irradiation
C02F 1/34 with mechanical oscillations
C02F 1/38 by centrifugal separation
C02F 1/4 Devices for separating or removing fatty or oily substances or similar floating material
C02F 1/42 by ion-exchange
C02F 1/44 by dialysis, osmosis or reverse osmosis
C02F 1/46 by electrochemical methods
C02F 1/48 with magnetic or electric fields
C02F 1/5 by addition or application of a germicide or by oligodynamic treatment
C02F 1/52 by flocculation or precipitation of suspended impurities
C02F 1/58 by removing specified dissolved compounds
C02F 1/66 by neutralisation; pH adjustment
C02F 1/68 by addition of specified substances, e.g. trace elements, for ameliorating potable water
C02F 1/7 by reduction

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