(19)

(11)

EP 4 508 307 A1

(12)

(43) Date of publication: 19.02.2025 Bulletin 2025/08 (21) Application number: 23722926.5 (22) Date of filing: 12.04.2023

(51) International Patent Classification (IPC):  E21D 9/06(2006.01) E21D 11/10(2006.01) (52) Cooperative Patent Classification (CPC): E21D 9/0621; E21D 11/10 (86) International application number: PCT/GB2023/050981 (87) International publication number: WO 2023/199056 (19.10.2023 Gazette 2023/42)

(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: 14.04.2022 GB 202205597 (71) Applicant: Colin Eddie Consulting Limited Wolston, Warwickshire CV8 3FX (GB)	(72) Inventor: EDDIE, Colin Michael Rugby Warwickshire CV22 7PX (GB) (74) Representative: Hanson, William Bennett  Bromhead Johnson LLP 57-59 High Street Twyford, Berkshire RG10 9AJ 57-59 High Street Twyford, Berkshire RG10 9AJ (GB)