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EP 4 816 599 A1

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(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24896800.0 (22) Date of filing: 28.11.2024

(51) International Patent Classification (IPC):  C25B 15/08(2006.01) C25B 9/75(2021.01) C25B 9/21(2021.01) C25B 9/77(2021.01) (52) Cooperative Patent Classification (CPC): C25B 9/77; C25B 9/21; C25B 9/75; C25B 15/08; C25B 1/04; C25B 9/19; C25B 9/70; Y02E 60/36 (86) International application number: PCT/DK2024/050286 (87) International publication number: WO 2025/113761 (05.06.2025 Gazette 2025/23)

(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: GE KH MA MD TN (30) Priority: 29.11.2023 DK PA202330357 (71) Applicant: Stiesdahl Hydrogen A/S 7323 Give (DK)	(72) Inventors: STIESDAL, Henrik 5000 Odense C (DK) VOIGT, Niels Vinter 8200 Aarhus N (DK) NEDERGAARD, Asger Aaen 2100 København (DK) HEMMINGSEN, Casper Schytte 3050 Humlebæk (DK) NIELSEN, Kenny Krogh 4000 Roskilde (DK) ROGIE, Brice 1751 København (DK) (74) Representative: Medenwaldt, Robin  Tropa ApS Aagade 97, 1st Floor 8370 Hadsten 8370 Hadsten (DK)