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(11)

EP 4 558 663 A2

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(88) Date of publication A3: 04.07.2024 (43) Date of publication: 28.05.2025 Bulletin 2025/22 (21) Application number: 23798882.9 (22) Date of filing: 22.09.2023

(51) International Patent Classification (IPC):  C25B 1/04(2021.01) C25B 9/70(2021.01) C25B 9/65(2021.01) C25B 15/02(2021.01) (52) Cooperative Patent Classification (CPC): C25B 9/65; C25B 15/02; C25B 9/70; C25B 1/04 (86) International application number: PCT/EP2023/076181 (87) International publication number: WO 2024/068452 (04.04.2024 Gazette 2024/14)

(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: 29.09.2022 CN 202211202481 (71) Applicant: Siemens Energy Global GmbH & Co. KG 81739 München (DE)	(72) Inventors: ACHTER, Thomas 91301 Forchheim (DE) ZHOU, Kunyuan 14055 Berlin (DE) HU, Da Lin Shang Hai, 2399 (CN)