(19)

(11)

EP 4 680 809 A1

(12)

(43) Date of publication: 21.01.2026 Bulletin 2026/04 (21) Application number: 24768899.7 (22) Date of filing: 12.03.2024

(51) International Patent Classification (IPC):  E01C 23/16(2006.01) E01F 9/00(2016.01) (52) Cooperative Patent Classification (CPC): E01C 23/163; E01C 23/222 (86) International application number: PCT/FI2024/050106 (87) International publication number: WO 2024/189268 (19.09.2024 Gazette 2024/38)

(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: GE KH MA MD TN (30) Priority: 16.03.2023 FI 20235304 (71) Applicant: Airoad Oy 95300 Tervola (FI)	(72) Inventors: LEINONEN, Aki 96440 Rovaniemi (FI) LEINONEN, Ari 95300 Tervola (FI) (74) Representative: Berggren Oy  P.O. Box 16 Fabianinkatu 21 00101 Helsinki 00101 Helsinki (FI)