(19)

(11)

EP 4 150 168 A1

(12)

(43) Date of publication: 22.03.2023 Bulletin 2023/12 (21) Application number: 21726961.2 (22) Date of filing: 12.05.2021

(51) International Patent Classification (IPC):  E03D 9/02(2006.01) (52) Cooperative Patent Classification (CPC): E03D 9/033; E03D 9/007 (86) International application number: PCT/GB2021/051131 (87) International publication number: WO 2021/229216 (18.11.2021 Gazette 2021/46)

(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: 12.05.2020 GB 202006948 (71) Applicant: GREENTECK GLOBAL LIMITED Chorley Lancashire PR7 6TB (GB)	(72) Inventor: THURSTON, David Gifford Oxfordshire OX10 8DS (GB) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)