(19)

(11)

EP 4 771 657 A1

(12)

(43) Date of publication: 08.07.2026 Bulletin 2026/28 (21) Application number: 24858896.4 (22) Date of filing: 30.08.2024

(51) International Patent Classification (IPC):  H01F 6/06(2006.01) H01F 6/00(2006.01) G01R 33/035(2006.01) H01F 7/02(2006.01) (52) Cooperative Patent Classification (CPC): H01F 6/06; G21B 1/05 (86) International application number: PCT/IB2024/058442 (87) International publication number: WO 2025/046522 (06.03.2025 Gazette 2025/10)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 30.08.2023 AU 2023902794 (71) Applicant: Open Star Technologies Limited Ngauranga, Wellington 6035 (NZ)	(72) Inventors: SIMPSON, Thomas Ewan Wellington, 6035 (NZ) MATAIRA-COLE, Ratu Craig Te Ahurangi Wellington, 6035 (NZ) (74) Representative: Piotrowicz, Pawel Jan Andrzej et al Venner Shipley LLP 406 Cambridge Science Park Milton Road Cambridge CB4 0WW Cambridge CB4 0WW (GB)