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(11)

EP 4 153 819 A1

(12)

(43) Date of publication: 29.03.2023 Bulletin 2023/13 (21) Application number: 21809193.2 (22) Date of filing: 06.05.2021

(51) International Patent Classification (IPC):  E03D 3/10(2006.01) E03D 1/38(2006.01) E03D 11/02(2006.01) (52) Cooperative Patent Classification (CPC): E03D 1/14; E03D 1/18; E03D 5/00; E03D 5/01 (86) International application number: PCT/SE2021/050428 (87) International publication number: WO 2021/235992 (25.11.2021 Gazette 2021/47)

(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: 22.05.2020 SE 2000095 (71) Applicant: Impulser AB 19452 Upplands Väsby (SE)	(72) Inventor: MATTSSON, Bo 194 52 Upplands Väsby (SE) (74) Representative: Herbjørnsen, Rut  Trona Patentrådgivning AB Rosterigränd 4 117 61 Stockholm 117 61 Stockholm (SE)