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(11)

EP 4 824 421 A1

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(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 23961661.8 (22) Date of filing: 11.12.2023

(51) International Patent Classification (IPC):  F04C 29/04(2006.01) F04B 39/02(2006.01) F04C 23/00(2006.01) F04B 25/00(2006.01) F04B 39/06(2006.01) F04C 29/02(2006.01) (52) Cooperative Patent Classification (CPC): F04C 29/04; F04B 25/00; F04B 39/06; F04B 39/0284; F04C 18/12; F04C 23/001; F04C 2240/806 (86) International application number: PCT/US2023/083302 (87) International publication number: WO 2025/128075 (19.06.2025 Gazette 2025/25)

(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: KH MA MD TN (71) Applicant: Hitachi Global Air Power US, LLC Michigan City, IN 46360 (US)	(72) Inventors: VALENCIC, Abram Michigan City, Indiana 46360 (US) LOW, Donald Michigan City, Indiana 46360 (US) FANDOHAN, Comlan Michigan City, Indiana 46360 (US) (74) Representative: MERH-IP Matias Erny Reichl Hoffmann Patentanwälte PartG mbB  Paul-Heyse-Straße 29 80336 München 80336 München (DE)