(19)

(11)

EP 3 959 390 A1

(12)

(43) Date of publication: 02.03.2022 Bulletin 2022/09 (21) Application number: 20795746.5 (22) Date of filing: 20.04.2020

(51) International Patent Classification (IPC):  E04B 2/78(2006.01) (52) Cooperative Patent Classification (CPC): E04B 2001/2472; E04B 9/245; E04B 2/789; E04B 2/767; E04C 3/07; E04B 2001/2448; E04B 9/16; E04B 2/7457; E04C 2003/0473 (86) International application number: PCT/IN2020/050369 (87) International publication number: WO 2020/217251 (29.10.2020 Gazette 2020/44)

(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: 24.04.2019 IN 201941016268 (71) Applicant: SAINT-GOBAIN PLACO 92400 Courbevoie (FR)	(72) Inventors: S, Vikram Chennai, Tamil Nadu, Chennai 600091 (IN) AHMED, Rizwan Maharashtra, Mumbai 400070 (IN) SAMINATHAN, Kanakavel Siruseri, Chennai 603103 (IN) (74) Representative: Saint-Gobain Recherche  B.P. 135 39, quai Lucien Lefranc 93303 Aubervilliers Cedex 93303 Aubervilliers Cedex (FR)