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(11)

EP 4 168 367 A1

(12)

(43) Date of publication: 26.04.2023 Bulletin 2023/17 (21) Application number: 21735745.8 (22) Date of filing: 22.06.2021

(51) International Patent Classification (IPC):  C03C 17/36(2006.01) C03C 17/06(2006.01) C03C 1/00(2006.01) C03C 17/34(2006.01) (52) Cooperative Patent Classification (CPC): C03C 2218/32; C03C 2217/71; C03C 2217/732; C03C 2217/734; C03C 2217/42; C03C 17/06; C03C 17/3482; C03C 17/3417; C03C 2218/365; C03C 1/00 (86) International application number: PCT/GB2021/051587 (87) International publication number: WO 2021/260370 (30.12.2021 Gazette 2021/52)

(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: 23.06.2020 US 202063042787 P 21.07.2020 GB 202011249 (71) Applicant: Pilkington Group Limited Lathom Nr. Ormskirk Lancashire L40 5UF (GB)

(72) Inventors: MCKITTRICK, Tim Southport Merseyside PR8 2NJ (GB) WEIDNER, Stephen Emil Maumee, Ohio 43537 (US) BACK, Rory Liverpool Merseyside L18 3EW (GB) MCSPORRAN, Neil Liverpool Merseyside L19 9BR (GB) VARANASI, Srikanth Ottawa Hills, Ohio 43606 (US) (74) Representative: Hope, Adam John et al Pilkington Technology Management Limited European Technical Centre Hall Lane Lathom Ormskirk, Lancashire L40 5UF Ormskirk, Lancashire L40 5UF (GB)