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(11)

EP 4 090 640 A1

(12)

(43) Date of publication: 23.11.2022 Bulletin 2022/47 (21) Application number: 21701592.4 (22) Date of filing: 13.01.2021

(51) International Patent Classification (IPC):  C04B 33/02(2006.01) C04B 35/626(2006.01) (52) Cooperative Patent Classification (CPC): C04B 33/02; C04B 35/62695; C04B 35/62655; C04B 35/62625; C04B 2235/6021; Y02P 40/60 (86) International application number: PCT/IB2021/050209 (87) International publication number: WO 2021/144700 (22.07.2021 Gazette 2021/29)

(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: 16.01.2020 IT 202000000745 (71) Applicant: Certech S.p.a 41049 Sassuolo (Modena) (IT)	(72) Inventor: PALLADINI, Valter 42013 Casalgrande (Reggio Emilia) (IT) (74) Representative: Casadei, Giovanni  Bugnion S.p.A. Via Vellani Marchi, 20 41124 Modena 41124 Modena (IT)