(19)

(11)

EP 4 256 137 A1

(12)

(43) Date of publication: 11.10.2023 Bulletin 2023/41 (21) Application number: 21836626.8 (22) Date of filing: 29.11.2021

(51) International Patent Classification (IPC):  E02D 29/02(2006.01) (52) Cooperative Patent Classification (CPC): E02D 29/0208 (86) International application number: PCT/IB2021/061071 (87) International publication number: WO 2022/118173 (09.06.2022 Gazette 2022/23)

(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 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 (30) Priority: 01.12.2020 IT 202000029318 (71) Applicant: Metallurgica Ledrense - Societa Cooperativa 38067 Ledro (TN) (IT)	(72) Inventor: TIBONI, Fabio 38067 Ledro (TN) (IT) (74) Representative: Simino, Massimo  Bugnion S.p.A. Viale Lancetti, 17 20158 Milano 20158 Milano (IT)