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(11)

EP 4 505 034 A1

(12)

(43) Date of publication: 12.02.2025 Bulletin 2025/07 (21) Application number: 23722660.0 (22) Date of filing: 04.04.2023

(51) International Patent Classification (IPC):  E21B 7/02(2006.01) E21B 17/18(2006.01) E21B 19/15(2006.01) F16L 9/18(2006.01) (52) Cooperative Patent Classification (CPC): E21B 19/15; E21B 7/024; E21B 17/18 (86) International application number: PCT/IB2023/053404 (87) International publication number: WO 2023/194898 (12.10.2023 Gazette 2023/41)

(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 (30) Priority: 04.04.2022 IT 202200006632 (71) Applicant: Fraste S.P.A. 37054 Nogara (VR) (IT)	(72) Inventors: FRACCA, Vittorio 37054 VERONA (IT) DOSSO, Lorenzo 37054 VERONA (IT) VISENTINI, Igor 37053 VERONA (IT) (74) Representative: Locas, Davide et al Cantaluppi & Partners S.r.l. Piazzetta Cappellato Pedrocchi, 18 35122 Padova 35122 Padova (IT)