(19)

(11)

EP 4 291 733 A1

(12)

(43) Date of publication: 20.12.2023 Bulletin 2023/51 (21) Application number: 21720594.7 (22) Date of filing: 22.03.2021

(51) International Patent Classification (IPC):  E04B 1/34(2006.01) E04B 1/35(2006.01) E04B 1/348(2006.01) (52) Cooperative Patent Classification (CPC): E04B 1/3404; E04B 1/3511; E04B 1/34815 (86) International application number: PCT/PL2021/000015 (87) International publication number: WO 2022/173316 (18.08.2022 Gazette 2022/33)

(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: 09.02.2021 PL 43690721 (71) Applicant: Wisniewski, Jaroslaw 05-090 Raszyn (PL)	(72) Inventor: Wisniewski, Jaroslaw 05-090 Raszyn (PL) (74) Representative: Dziubinska, Joanna  Kancelaria Patentowa ul. Wyszynskiego 58 m 25 94-047 Lodz 94-047 Lodz (PL)