(19)

(11)

EP 4 493 739 A2

(12)

(88) Date of publication A3: 23.11.2023 (43) Date of publication: 22.01.2025 Bulletin 2025/04 (21) Application number: 23711494.7 (22) Date of filing: 17.03.2023

(51) International Patent Classification (IPC):  C23F 13/10(2006.01) C23F 13/18(2006.01) (52) Cooperative Patent Classification (CPC): C23F 13/18; C23F 13/10; C23F 2213/31 (86) International application number: PCT/EP2023/056931 (87) International publication number: WO 2023/175164 (21.09.2023 Gazette 2023/38)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 18.03.2022 NL 2031333 (71) Applicant: Corrosion&water Control Shared Services B.V. 2751 DB Moerkapelle (NL)	(72) Inventor: VAN DER SPEK, Jacob Daniel 4191 NP GELDERMALSEN (NL) (74) Representative: EP&C  P.O. Box 3241 2280 GE Rijswijk 2280 GE Rijswijk (NL)