(19)

(11)

EP 3 911 804 A1

(12)

(43) Date of publication: 24.11.2021 Bulletin 2021/47 (21) Application number: 20701095.0 (22) Date of filing: 09.01.2020

(51) International Patent Classification (IPC):  E04B 2/08(2006.01) E04B 2/02(2006.01) E04C 1/41(2006.01) (52) Cooperative Patent Classification (CPC): E04B 2002/0208; E04C 1/41; E04B 2002/0206; E04B 2/08; E04B 2002/0254 (86) International application number: PCT/GB2020/050041 (87) International publication number: WO 2020/148519 (23.07.2020 Gazette 2020/30)

(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: 17.01.2019 GB 201900666 (71) Applicant: Zicon Limited Weybridge Surrey KT13 8XB (GB)	(72) Inventor: GRAY, Ramon John Weybridge Surrey KT13 8XB (GB) (74) Representative: Higgs, Jonathan  Urquhart-Dykes & Lord LLP Altius House 1 North Fourth Street Milton Keynes MK9 1DG Milton Keynes MK9 1DG (GB)