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(11)

EP 4 370 258 A1

(12)

(43) Date of publication: 22.05.2024 Bulletin 2024/21 (21) Application number: 22751695.2 (22) Date of filing: 14.07.2022

(51) International Patent Classification (IPC):  B21C 23/06(2006.01) B21C 27/00(2006.01) B21C 25/02(2006.01) B21C 33/00(2006.01) (52) Cooperative Patent Classification (CPC): B21C 23/06; B21C 25/02; B21C 27/00; B21C 33/00 (86) International application number: PCT/EP2022/069754 (87) International publication number: WO 2023/285602 (19.01.2023 Gazette 2023/03)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 15.07.2021 GB 202110215 (71) Applicant: IMPERIAL COLLEGE INNOVATIONS LIMITED London SW7 2AZ (GB)	(72) Inventors: LI, Weishu London Greater London SW7 2AZ (GB) LV, Jiaxin London Greater London SW7 2AZ (GB) YU, Junquan London Greater London SW7 2AZ (GB) SHI, Zhusheng London Greater London SW7 2AZ (GB) LIN, Jianguo London Greater London SW7 2AZ (GB) (74) Representative: Taylor, Gail  Kilburn & Strode LLP Lacon London 84 Theobalds Road London WC1X 8NL London WC1X 8NL (GB)