(19)

(11)

EP 4 128 366 A1

(12)

(43) Date of publication: 08.02.2023 Bulletin 2023/06 (21) Application number: 21716816.0 (22) Date of filing: 23.03.2021

(51) International Patent Classification (IPC):  H01L 31/0352(1990.01) H01L 31/05(1990.01) H01L 31/047(2014.01) H01L 31/18(1974.07) (52) Cooperative Patent Classification (CPC): H01L 31/035281; H01L 31/047; H01L 31/0504; H01L 31/1876; Y02P 70/50; Y02E 10/50 (86) International application number: PCT/GB2021/050707 (87) International publication number: WO 2021/191597 (30.09.2021 Gazette 2021/39)

(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: 27.03.2020 GB 202004534 (71) Applicant: Power Roll Limited Sunderland Tyne and Wear SR5 3NZ (GB)	(72) Inventor: MCARDLE, Trevor Sunderland Tyne and Wear SR5 3NZ (GB) (74) Representative: HGF  HGF Limited 1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)