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EP 4 824 534 A1

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(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24850263.5 (22) Date of filing: 12.12.2024

(51) International Patent Classification (IPC):  G01N 24/08(2006.01) G01R 33/44(2006.01) G01N 1/20(2006.01) D21D 1/20(2006.01) G01N 15/08(2006.01) G01R 33/30(2006.01) (52) Cooperative Patent Classification (CPC): G01N 24/085; G01R 33/448; G01R 33/307; G01N 1/2035; D21D 1/20; G01N 24/082; D21G 9/0018; G01N 15/088 (86) International application number: PCT/FI2024/050681 (87) International publication number: WO 2025/125724 (19.06.2025 Gazette 2025/25)

(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: 14.12.2023 FI 20236370 (71) Applicant: Kaakkois-Suomen Ammattikorkeakoulu Oy 50100 Mikkeli (FI)	(72) Inventors: HILTUNEN, Yrjö 57200 SAVONLINNA (FI) NIKOLSKAYA, Ekaterina 57200 SAVONLINNA (FI) TIRRI, Tapio 57200 SAVONLINNA (FI) PULKKINEN, Lasse 57200 SAVONLINNA (FI) (74) Representative: Kespat Oy  Vasarakatu 23a 40320 Jyväskylä 40320 Jyväskylä (FI)