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(11)

EP 4 569 605 A2

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(88) Date of publication A3: 14.03.2024 (43) Date of publication: 18.06.2025 Bulletin 2025/25 (21) Application number: 23748091.8 (22) Date of filing: 21.07.2023

(51) International Patent Classification (IPC):  H02M 1/42(2007.01) C25B 1/04(2021.01) H02M 7/487(2007.01) B01D 61/46(2006.01) H02M 7/06(2006.01) (52) Cooperative Patent Classification (CPC): H02M 1/4216; H02M 7/487; H02M 7/06; B01D 61/46; C25B 1/04; H02M 1/009; B01D 61/422; B01D 2311/04; B01D 2311/263; C25B 15/02; C25B 9/75; C25B 9/77 (86) International application number: PCT/FI2023/050446 (87) International publication number: WO 2024/033568 (15.02.2024 Gazette 2024/07)

(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 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: 09.08.2022 FI 20225710 (71) Applicant: Lappeenrannan-Lahden teknillinen yliopisto LUT 53851 Lappeenranta (FI)	(72) Inventors: KORHONEN, Juhamatti 53851 Lappeenranta (FI) PELTONIEMI, Pasi 53851 Lappeenranta (FI) (74) Representative: Väänänen, Janne Kalervo  Vanarix Oy Laaksolahdentie 74 02730 Espoo 02730 Espoo (FI)