(19)

(11)

EP 3 921 292 A1

(12)

(43) Date of publication: 15.12.2021 Bulletin 2021/50 (21) Application number: 19706303.5 (22) Date of filing: 05.02.2019

(51) International Patent Classification (IPC):  C04B 35/488(2006.01) C01G 25/02(2006.01) C04B 35/486(2006.01) C04B 35/626(2006.01) A61K 6/00(2020.01) C01G 25/00(2006.01) B82Y 30/00(2011.01) C04B 35/624(2006.01) C04B 35/64(2006.01) (52) Cooperative Patent Classification (CPC): C01F 7/02; C01P 2004/04; C04B 2235/725; C04B 2235/77; C01P 2002/76; C01G 27/02; C01G 25/02; C01P 2006/80; B82Y 30/00; C01P 2002/72; C04B 2235/765; C04B 2235/781; C01P 2006/22; C04B 2235/762; C04B 35/4885; C01P 2004/51; C04B 2235/3225; C04B 2235/728; C04B 2235/722; C04B 2235/3246; C04B 35/6263; C04B 35/486; C04B 35/624; C04B 35/62625; C01P 2004/64; C04B 2235/96; C04B 2235/5454; C04B 2235/72; C04B 2235/724; A61K 6/818; C04B 2235/3217; A61K 6/17; C01F 17/206; C04B 35/64; C04B 2235/76 (86) International application number: PCT/GB2019/050299 (87) International publication number: WO 2020/161451 (13.08.2020 Gazette 2020/33)

(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 (71) Applicant: Magnesium Elektron Limited Manchester M27 8LN (GB)	(72) Inventor: WISEMAN, William Manchester M27 8LN (GB) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)