(19)

(11)

EP 3 749 788 A1

(12)

(43) Date of publication: 16.12.2020 Bulletin 2020/51 (21) Application number: 19707472.7 (22) Date of filing: 30.01.2019

(51) International Patent Classification (IPC):  C14B 1/44(2006.01) C14B 17/00(2006.01) C14B 3/00(2006.01) C14C 15/00(2006.01) (86) International application number: PCT/IB2019/050733 (87) International publication number: WO 2019/150268 (08.08.2019 Gazette 2019/32)

(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: 05.02.2018 IT 201800002404 (71) Applicant: Erretre S.p.A. 36071 Arzignano (Vicenza) (IT)	(72) Inventor: GALIOTTO, Antonio 36072 Chiampo (IT) (74) Representative: Contadin, Giorgio et al Notarbartolo & Gervasi S.p.A. Viale Achille Papa, 30 20149 Milano 20149 Milano (IT)