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(11)

EP 4 237 635 A1

(12)

(43) Date of publication: 06.09.2023 Bulletin 2023/36 (21) Application number: 20960071.7 (22) Date of filing: 27.10.2020

(51) International Patent Classification (IPC):  E04B 1/61(2006.01) E04G 21/14(2006.01) E04B 2/56(2006.01) (52) Cooperative Patent Classification (CPC): E04B 1/043 (86) International application number: PCT/SG2020/050615 (87) International publication number: WO 2022/093104 (05.05.2022 Gazette 2022/18)

(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 (71) Applicants: Wong, Seng Singapore 536412 (SG) Leow, Geok Mui Maey Singapore 554361 (SG) Heng, Kim Huat Singapore 689103 (SG)	(72) Inventors: Wong, Seng Singapore 536412 (SG) Leow, Geok Mui Maey Singapore 554361 (SG) Heng, Kim Huat Singapore 689103 (SG) (74) Representative: Sugden, Mark William  Withers & Rogers LLP 2 London Bridge London SE1 9RA London SE1 9RA (GB)