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(11)

EP 4 255 644 A1

(12)

(43) Date of publication: 11.10.2023 Bulletin 2023/41 (21) Application number: 21820655.5 (22) Date of filing: 17.11.2021

(51) International Patent Classification (IPC):  B08B 3/12(2006.01) B06B 3/00(2006.01) B08B 9/032(2006.01) (52) Cooperative Patent Classification (CPC): B08B 7/028; B08B 9/032; B08B 2209/005; B08B 3/12; B06B 3/00 (86) International application number: PCT/FI2021/050779 (87) International publication number: WO 2022/117909 (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 FI 20206235 (71) Applicant: Altum Technologies OY 00130 Helsinki (FI)	(72) Inventors: MOILANEN, Petro 40930 KINKOMAA (FI) RAUHALA, Timo 00140 HELSINKI (FI) SALMI, Ari 00640 HELSINKI (FI) HAEGGSTRÖM, Edward 00140 HELSINKI (FI) (74) Representative: Hovinen, Jari Juhani  Finnpatent Oy Smart Chemistry Park Raisionkaari 55 21200 Raisio 21200 Raisio (FI)