(19)

(11)

EP 4 532 858 A1

(12)

(43) Date of publication: 09.04.2025 Bulletin 2025/15 (21) Application number: 23731343.2 (22) Date of filing: 02.06.2023

(51) International Patent Classification (IPC):  E04C 2/28(2006.01) E04B 2/02(2006.01) E04B 2/86(2006.01) (52) Cooperative Patent Classification (CPC): E04C 2/28; E04B 2002/0206; E04B 1/6125; E04B 1/14 (86) International application number: PCT/GB2023/051458 (87) International publication number: WO 2023/233168 (07.12.2023 Gazette 2023/49)

(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: KH MA MD TN (30) Priority: 02.06.2022 GB 202208188 (71) Applicant: Cairnhill Structures Limited Coatbridge Lanarkshire Borders ML5 2BE (GB)	(72) Inventors: DENNING, Paul Martin Richmond Yorkshire DL10 5PT (GB) WATSON, Neil Glasgow Strathclyde G12 0YA (GB) (74) Representative: Cameron Intellectual Property Ltd  Moncrieff House 69 West Nile Street Glasgow G1 2QB Glasgow G1 2QB (GB)