(19)

(11)

EP 4 301 927 A1

(12)

(43) Date of publication: 10.01.2024 Bulletin 2024/02 (21) Application number: 21720312.4 (22) Date of filing: 05.03.2021

(51) International Patent Classification (IPC):  E01B 1/00(2006.01) E01B 3/34(2006.01) E01B 29/00(2006.01) E01B 2/00(2006.01) E01B 3/40(2006.01) E01B 29/05(2006.01) (52) Cooperative Patent Classification (CPC): E01B 3/40; E01B 3/34; E01B 29/005; E01B 1/007; E01B 2/003; E01B 29/05 (86) International application number: PCT/IB2021/051852 (87) International publication number: WO 2022/185101 (09.09.2022 Gazette 2022/36)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: Overail S.r.l. 00138 Roma (RM) (IT)	(72) Inventor: SALCICCIA, Gilberto 00138 Roma RM (IT) (74) Representative: Papa, Elisabetta et al Società Italiana Brevetti S.p.A Piazza di Pietra, 39 00186 Roma 00186 Roma (IT)