(19)

(11)

EP 4 824 391 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24837131.2 (22) Date of filing: 11.12.2024

(51) International Patent Classification (IPC):  E21B 43/16(2006.01) E21B 43/26(2006.01) C01B 3/02(2026.01) E21B 43/28(2006.01) (52) Cooperative Patent Classification (CPC): E21B 43/16; E21B 43/26; E21B 43/28; C01B 3/061 (86) International application number: PCT/IB2024/062520 (87) International publication number: WO 2025/126076 (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: GE KH MA MD TN (30) Priority: 12.12.2023 US 202363608941 P (71) Applicant: Vema Hydrogen, Inc. Wilmington, Delaware 19808 (US)	(72) Inventor: OSSELIN, Florian Wilmington, Delaware 19808 (US) (74) Representative: Evens, Paul Jonathan et al Maguire Boss 24 East Street St. Ives, Cambridgeshire PE27 5PD St. Ives, Cambridgeshire PE27 5PD (GB)