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(11)

EP 4 798 536 A1

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(43) Date of publication: 02.09.2026 Bulletin 2026/36 (21) Application number: 24837140.3 (22) Date of filing: 12.12.2024

(51) International Patent Classification (IPC):  C01B 17/04(2006.01) C01B 17/16(2006.01) C01B 3/00(2026.01) C22B 5/12(2006.01) (52) Cooperative Patent Classification (CPC): C22B 5/12; C01B 17/165; C01B 17/0495; C01B 3/04; C01B 3/08; C01B 2203/0272; C01B 2203/0277; C01B 2203/0861; C01B 2203/0405; C01B 2203/043; C01B 2203/046; C01B 3/50 (86) International application number: PCT/IB2024/062576 (87) International publication number: WO 2025/126108 (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: 12.12.2023 US 202363608934 P (71) Applicant: Outokumpu Oyj 00180 Helsinki (FI)	(72) Inventors: STINN, Caspar Haverhill, Massachusetts 01832 (US) HYTTINEN, Niko 95410 Tornio (FI) ERKKILÄ, Juha 01640 Vantaa (FI)