(19)

(11)

EP 4 136 299 A1

(12)

(43) Date of publication: 22.02.2023 Bulletin 2023/08 (21) Application number: 21789586.1 (22) Date of filing: 15.04.2021

(51) International Patent Classification (IPC):  E04G 1/36(2006.01) E04G 5/14(2006.01) (52) Cooperative Patent Classification (CPC): E04G 5/14; E04G 1/367; E04G 5/046; E04G 21/3204; E04G 27/00; E04G 7/307; E04G 1/152 (86) International application number: PCT/IB2021/053092 (87) International publication number: WO 2021/209931 (21.10.2021 Gazette 2021/42)

(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 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: 15.04.2020 AU 2020901192 (71) Applicant: WLS Intellectual Property Limited Aberdeen (HK)	(72) Inventor: LAI, Yuen Mei Rebecca Wong Chuk Hang Aberdeen (HK) (74) Representative: Carpmaels & Ransford LLP  One Southampton Row London WC1B 5HA London WC1B 5HA (GB)