Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F1/42)

Filing statistics

CPC C02F 5/00 belongs to the parent subclass C02F, which recorded 316,465 patent applications worldwide between 2013 and 2023. Annual filings grew from 12,795 in 2013 to 28,600 in 2023 (+124%), peaking at 39,882 applications in 2018. The most active applicants in class C02 are CHINESE ACADEMY OF SCIENCES (2,531 applications), SINOPEC (CHINA PETROCHEMICAL CORPORATION) (1,700 applications) and KURITA WATER IND (1,287 applications).

Source: EPO PATSTAT, worldwide filings

2 direct subcodes

Child Classifications

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C02F 5/02 Softening water by precipitation of the hardness
C02F 5/08 Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents

Top Applicants

Top 10 applicants by patent filingsfor 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