(19)

(11)

EP 4 103 526 A1

(12)

(43) Date of publication: 21.12.2022 Bulletin 2022/51 (21) Application number: 21754042.6 (22) Date of filing: 12.02.2021

(51) International Patent Classification (IPC):  C04B 7/17(2006.01) C04B 7/28(2006.01) C04B 7/26(2006.01) (52) Cooperative Patent Classification (CPC): C04B 28/021; C04B 28/08; C04B 2111/0075; C04B 2111/00732; C04B 2111/00724; Y02W 30/91   C-Sets: C04B 28/021, C04B 14/361, C04B 18/101, C04B 18/103, C04B 18/141, C04B 18/26, C04B 22/062; C04B 28/08, C04B 14/361, C04B 18/08, C04B 18/101, C04B 18/103, C04B 18/26, C04B 22/062; (86) International application number: PCT/FI2021/050100 (87) International publication number: WO 2021/160939 (19.08.2021 Gazette 2021/33)

(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: 13.02.2020 FI 20205150 (71) Applicant: Fatec Oy 71800 Siilinjärvi (FI)	(72) Inventor: HEIKKINEN-MUSTONEN, Aino 71800 Siilinjärvi (FI) (74) Representative: Salomäki, Juha Kari Ensio  Salomaki Oy Kankurinkatu 4-6 05800 Hyvinkää 05800 Hyvinkää (FI)