(19)

(11)

EP 3 880 969 A1

(12)

(43) Date of publication: 22.09.2021 Bulletin 2021/38 (21) Application number: 19804785.4 (22) Date of filing: 07.11.2019

(51) International Patent Classification (IPC):  F04D 19/04(2006.01) F04D 29/58(2006.01) F04D 25/06(2006.01) (52) Cooperative Patent Classification (CPC): F04D 19/044; F04D 29/5806; F04D 25/0606; F04D 19/046 (86) International application number: PCT/GB2019/053149 (87) International publication number: WO 2020/099834 (22.05.2020 Gazette 2020/21)

(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: 14.11.2018 GB 201818600 (71) Applicant: Edwards Limited Burgess Hill, Sussex RH15 9TW (GB)	(72) Inventors: PATEY, Alexander James Burgess Hill Sussex RH15 9TW (GB) HORLER, Richard Glyn 783 49 Olomouc (CZ) (74) Representative: Totman, Clare Elizabeth  Edwards Limited Innovation Drive GB-Burgess Hill, West Sussex RH15 9TW GB-Burgess Hill, West Sussex RH15 9TW (GB)