(19)

(11)

EP 4 256 146 A1

(12)

(43) Date of publication: 11.10.2023 Bulletin 2023/41 (21) Application number: 21835960.2 (22) Date of filing: 30.11.2021

(51) International Patent Classification (IPC):  E04B 1/94(2006.01) E04B 1/14(2006.01) E04C 2/296(2006.01) (52) Cooperative Patent Classification (CPC): E04B 1/14; E04B 1/942; E04C 2/296; E04C 2/528; E04C 2/386; E04C 2/384; E04C 2/38 (86) International application number: PCT/EP2021/083508 (87) International publication number: WO 2022/117543 (09.06.2022 Gazette 2022/23)

(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: 02.12.2020 GB 202019013 23.02.2021 GB 202102571 (71) Applicant: Intumescent Systems Ltd Dover, Kent CT15 7JG (GB)	(72) Inventor: WARD, Derek Dover Kent CT15 7JG (GB) (74) Representative: Fry, David John  Agile IP LLP Airport House Purley Way Croydon, Surrey CR0 0XZ Croydon, Surrey CR0 0XZ (GB)