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EP 4 504 985 A1

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(43) Date of publication: 12.02.2025 Bulletin 2025/07 (21) Application number: 23781507.1 (22) Date of filing: 30.03.2023

(51) International Patent Classification (IPC):  C22B 3/12(2006.01) C22B 11/08(2006.01) (52) Cooperative Patent Classification (CPC): C22B 11/08; C22B 3/12; C22B 11/046; C22B 7/005; C22B 7/008; C22B 3/44; Y02P 10/20 (86) International application number: PCT/SG2023/050210 (87) International publication number: WO 2023/191722 (05.10.2023 Gazette 2023/40)

(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: 31.03.2022 SG 10202203313P (71) Applicant: Singapore Polytechnic Singapore 139651 (SG)

(72) Inventors: GOH, Fu Wei, Thomas Singapore Polytechnic, 500 Dover Road Singapore 139651 (SG) LIM, Zheng Bang Singapore Polytechnic, 500 Dover Road Singapore 139651 (SG) ANG, Sook Bee, Melissa Singapore Polytechnic, 500 Dover Road Singapore 139651 (SG) YIN, Xi Jiang Singapore Polytechnic, 500 Dover Road Singapore 139651 (SG) KOH, Cheng Yan, Jeane Singapore Polytechnic, 500 Dover Road Singapore 139651 (SG) (74) Representative: Fabry, Bernd  IP2 Patentanwalts GmbH Schlossstrasse 523-525 41238 Mönchengladbach 41238 Mönchengladbach (DE)