TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

Introduced: January 1980

Description

Covers chemical and physical processes for purifying, conditioning, or processing water, waste water, sewage, and sludge streams. Includes desalination, softening, disinfection, removal of suspended solids and dissolved contaminants, odor control, and sludge dewatering or disposal methods. This subclass encompasses treatment technologies such as coagulation, filtration, ion exchange, biological treatment, and oxidation processes applied across municipal, industrial, and agricultural applications.

Title

Titles differ between systems:

IPC: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

CPC: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

Full Title

Full titles differ between systems:

IPC:

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

CPC:

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes)

Additional Content IPC

Glossary

Sludge Solids that remain after wastewater treatment. This material may be separated, treated and composted into fertiliser.

Limiting references

Processes for making harmful chemical substances harmless, or less harmful, by effecting a chemical change in the substances Settling tanks and filter devices Adding materials to water to prevent corrosion Cleaning or keeping clear the surface of open water, e.g. the sea Devices for cleaning or keeping clear the surface of open water Methods for obtaining or collecting drinking water or tap water Treating radioactively-contaminated liquids

Application references

Special arrangements on waterborne vessels of installations for producing fresh water Special arrangements on waterborne vessels of installations for treating waste water or sewage.

Of 17 combined children, 6 exist in both systems.

9 codes are CPC-only extensions, 2 exist only in IPC.

Note: 9 CPC extensions are marked as secondary classification only.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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C02F 1/00 Treatment of water, waste water, or sewage (C02F3/00 - C02F9/00 take precedence) since 1980 +5 CPC IPC+CPC Available in IPC and CPC
C02F 101/00 Nature of the contaminant since 2000 −2 IPC IPC only IPC only
C02F 103/00 Nature of the water, waste water, sewage or sludge to be treated since 2000 −16 IPC IPC only IPC only
C02F 11/00 Treatment of sludge; Devices therefor since 1980 +4 CPC IPC+CPC Available in IPC and CPC
C02F 2101/00 Nature of the contaminant 2nd only +4 CPC CPC only CPC only
C02F 2103/00 Nature of the water, waste water, sewage or sludge to be treated 2nd only +23 CPC CPC only CPC only
C02F 2201/00 Apparatus for treatment of water, waste water or sewage 2nd only +8 CPC CPC only CPC only
C02F 2203/00 Apparatus and plants for the biological treatment of water, waste water or sewage 2nd only +4 CPC CPC only CPC only
C02F 2209/00 Controlling or monitoring parameters in water treatment 2nd only +36 CPC CPC only CPC only
C02F 2301/00 General aspects of water treatment 2nd only +5 CPC CPC only CPC only
C02F 2303/00 Specific treatment goals 2nd only +13 CPC CPC only CPC only
C02F 2305/00 Use of specific compounds during water treatment 2nd only +7 CPC CPC only CPC only
C02F 2307/00 Location of water treatment or water treatment device 2nd only +7 CPC CPC only CPC only
C02F 3/00 Biological treatment of water, waste water, or sewage since 1980 +4 CPC IPC+CPC Available in IPC and CPC
C02F 5/00 Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F1/42) since 1980 IPC+CPC Available in IPC and CPC
C02F 7/00 Aeration of stretches of water since 1980 IPC+CPC Available in IPC and CPC
C02F 9/00 Multistage treatment of water, waste water or sewage since 1980 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

Top Applicants (CPC)

Class C02,2013–2023, worldwide · Source: EPO PATSTAT

CHINESE ACADEMY OF SCIENCES 2,531
SINOPEC (CHINA PETROCHEMICAL CORPORATION) 1,700
KURITA WATER IND JP 1,287
TONGJI UNIVERSITY 1,040
CHANGZHOU UNIVERSITY 928
ECOLAB US 904
HARBIN INSTITUTE OF TECHNOLOGY 904
BEIJING UNIVERSITY OF TECHNOLOGY 878
HOHAI UNIVERSITY 862
EVOQUA WATER TECHNOLOGIES US 842