(19)

(11)

EP 4 816 672 A1

(12)

(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24898687.9 (22) Date of filing: 26.11.2024

(51) International Patent Classification (IPC):  E21B 47/017(2012.01) B65D 81/38(2006.01) A47J 41/02(2006.01) (52) Cooperative Patent Classification (CPC): E21B 47/0175 (86) International application number: PCT/US2024/057580 (87) International publication number: WO 2025/117620 (05.06.2025 Gazette 2025/23)

(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 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: 27.11.2023 US 202363602673 P (71) Applicant: HEPHAE ENERGY TECHNOLOGY Spring, TX 77379 (US)	(72) Inventors: PLATA, Gorka 48480 Zaratamo (ES) HARVEY, Peter Houston, TX 77006 (US) SINGH, Shraddha 48013 Bilbao (ES) (74) Representative: Acorn IP LLP  Colin Sanders Business Innovation Centre Mewburn Road Banbury Oxfordshire OX16 9PA Oxfordshire OX16 9PA (GB)