(19)

(11)

EP 3 717 778 A1

(12)

(43) Date of publication: 07.10.2020 Bulletin 2020/41 (21) Application number: 18804071.1 (22) Date of filing: 08.11.2018

(51) International Patent Classification (IPC):  F04D 25/06(2006.01) F04F 5/16(2006.01) F04D 25/08(2006.01) F24F 11/52(2018.01) (86) International application number: PCT/GB2018/053236 (87) International publication number: WO 2019/106335 (06.06.2019 Gazette 2019/23)

(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: 01.12.2017 GB 201720058 29.01.2018 GB 201801398 (71) Applicant: Dyson Technology Limited Malmesbury, Wiltshire SN16 0RP (GB)

(72) Inventors: JENNINGS, Matthew Malmesbury Wiltshire SN16 0RP (GB) KELLETT, Stuart Malmesbury Wiltshire SN16 0RP (GB) HEARD, Mark Malmesbury Wiltshire SN16 0RP (GB) BAKER, Stephen Malmesbury Wiltshire SN16 0RP (GB) (74) Representative: Chapman, Alan Gareth et al Dyson Technology Limited Intellectual Property Department Tetbury Hill Malmesbury, Wiltshire SN16 0RP Malmesbury, Wiltshire SN16 0RP (GB)