(19)

(11)

EP 4 551 542 A1

(12)

(43) Date of publication: 14.05.2025 Bulletin 2025/20 (21) Application number: 23834998.9 (22) Date of filing: 28.06.2023

(51) International Patent Classification (IPC):  C04B 40/02(2006.01) C01B 32/60(2017.01) (52) Cooperative Patent Classification (CPC): C04B 40/0231; B28B 11/245; B01D 53/62; B01D 2257/504   C-Sets: C04B 40/0231, C04B 28/02, C04B 38/00; (86) International application number: PCT/FI2023/050401 (87) International publication number: WO 2024/009001 (11.01.2024 Gazette 2024/02)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 04.07.2022 FI 20225625 (71) Applicant: Carbonaide Oy 80260 Joensuu (FI)	(72) Inventor: VEHMAS, Tapio 80260 Joensuu (FI) (74) Representative: Boco IP Oy Ab  Kansakoulukatu 3 00100 Helsinki 00100 Helsinki (FI)