(19)

(11)

EP 4 139 496 A1

(12)

(43) Date of publication: 01.03.2023 Bulletin 2023/09 (21) Application number: 21721160.6 (22) Date of filing: 14.04.2021

(51) International Patent Classification (IPC):  C23C 16/44(2006.01) F04D 29/02(2006.01) F04D 19/04(2006.01) (52) Cooperative Patent Classification (CPC): F04D 19/042; F04D 29/023; F05D 2230/90; C23C 16/4412 (86) International application number: PCT/GB2021/050897 (87) International publication number: WO 2021/214427 (28.10.2021 Gazette 2021/43)

(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: 23.04.2020 GB 202005964 (71) Applicant: Edwards Limited Burgess Hill, Sussex RH15 9TW (GB)	(72) Inventor: RUDGE, Oliver James Burgess Hill Sussex RH15 9TW (GB) (74) Representative: Totman, Clare Elizabeth  Edwards Limited Innovation Drive Burgess Hill, West Sussex RH15 9TW Burgess Hill, West Sussex RH15 9TW (GB)