(19)

(11)

EP 4 013 907 A1

(12)

(43) Date of publication: 22.06.2022 Bulletin 2022/25 (21) Application number: 20768416.8 (22) Date of filing: 12.08.2020

(51) International Patent Classification (IPC):  C25B 1/04(2021.01) C25B 9/19(2021.01) C25B 9/05(2021.01) C25B 9/70(2021.01) (52) Cooperative Patent Classification (CPC): C25B 1/04; C25B 9/05; C25B 9/19; C25B 9/70; Y02E 60/36; C25B 9/015 (86) International application number: PCT/NL2020/050509 (87) International publication number: WO 2021/029768 (18.02.2021 Gazette 2021/07)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 12.08.2019 NL 2023635 (71) Applicant: HYDRO-GEN BV 4251 NR Werkendam (NL)	(72) Inventor: MEERKERK, Arie 3381 KG GIESSENBURG (NL) (74) Representative: Huygens, Arthur Victor  Octrooibureau Huygens P.O. Box 86 3400 AB IJsselstein 3400 AB IJsselstein (NL)