(19)

(11)

EP 4 217 540 A1

(12)

(43) Date of publication: 02.08.2023 Bulletin 2023/31 (21) Application number: 21873065.3 (22) Date of filing: 24.09.2021

(51) International Patent Classification (IPC):  E01B 19/00(2006.01) E01B 5/08(2006.01) (52) Cooperative Patent Classification (CPC): E01B 19/003 (86) International application number: PCT/SE2021/050935 (87) International publication number: WO 2022/066091 (31.03.2022 Gazette 2022/13)

(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: 25.09.2020 EP 20198448 (71) Applicant: Vitrea AB 104 30 Stockholm (SE)	(72) Inventor: FRANTZICH, Mats 18352 Täby (SE) (74) Representative: Groth & Co. KB  P.O. Box 6107 102 32 Stockholm 102 32 Stockholm (SE)