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(11)

EP 4 294 889 A1

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(43) Date of publication: 27.12.2023 Bulletin 2023/52 (21) Application number: 22706100.9 (22) Date of filing: 21.02.2022

(51) International Patent Classification (IPC):  C09K 11/58(2006.01) C01G 3/04(2006.01) C09K 11/61(2006.01) (52) Cooperative Patent Classification (CPC): C09K 11/58; C09K 11/615; C01G 29/006; C01P 2002/77; C01P 2002/76 (86) International application number: PCT/GB2022/050469 (87) International publication number: WO 2022/175687 (25.08.2022 Gazette 2022/34)

(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: 19.02.2021 GB 202102360 (71) Applicant: Oxford University Innovation Limited Oxford, Oxfordshire OX2 0JB (GB)

(72) Inventors: SNAITH, Henry James Oxford Oxfordshire OX1 3PU (GB) SANSOM, Harry Oxford Oxfordshire OX1 3PU (GB) LONGO, Giulia Oxford Oxfordshire OX1 3PU (GB) PUTLAND, Benjamin Oxford Oxfordshire OX1 3PU (GB) ROSSEINSKY, Matthew Jonathan Liverpool Department of Chemistry, Crown Street Liverpool Merseyside L69 7ZD (GB) PITCHER, Michael Liverpool Department of Chemistry, Crown Street Liverpool Merseyside L69 7ZD (GB) CLARIDGE, John Liverpool Department of Chemistry, Crown Street Liverpool Merseyside L69 7ZD (GB) DYER, Matthew Liverpool Department of Chemistry, Crown Street Liverpool Merseyside L69 7ZD (GB) (74) Representative: J A Kemp LLP  80 Turnmill Street London EC1M 5QU London EC1M 5QU (GB)