(19)

(11)

EP 4 143 946 A1

(12)

(43) Date of publication: 08.03.2023 Bulletin 2023/10 (21) Application number: 21722874.1 (22) Date of filing: 30.04.2021

(51) International Patent Classification (IPC):  H02J 15/00(2006.01) F03G 3/00(2006.01) H02J 3/28(2006.01) H02K 7/02(2006.01) (52) Cooperative Patent Classification (CPC): F03G 3/094; H02J 3/28; H02J 15/007; H02K 7/025; H02K 11/21; Y02E 60/16 (86) International application number: PCT/EP2021/061479 (87) International publication number: WO 2021/219888 (04.11.2021 Gazette 2021/44)

(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: 01.05.2020 GB 202006511 26.05.2020 GB 202007857 27.05.2020 GB 202007946 (71) Applicant: Gravitricity Limited EdinburghEH6 4DD (GB)	(72) Inventors: FRANKLIN, Miles Yealmpton Devon PL8 2EH (GB) FRAENKEL, Peter London W13 8NQ (GB) (74) Representative: Ellis, Michael James  Ellis IP Ltd 53/4 George Street Edinburgh EH2 2HT Edinburgh EH2 2HT (GB)