(19)

(11)

EP 3 999 690 A1

(12)

(43) Date of publication: 25.05.2022 Bulletin 2022/21 (21) Application number: 20764914.6 (22) Date of filing: 08.07.2020

(51) International Patent Classification (IPC):  E04B 1/346(2006.01) B60B 33/04(2006.01) (52) Cooperative Patent Classification (CPC): E04B 1/346; B60B 33/045 (86) International application number: PCT/VN2020/000005 (87) International publication number: WO 2021/011969 (21.01.2021 Gazette 2021/03)

(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: 17.07.2019 VN 201903873 (71) Applicant: NGUYEN, Van Chanh Bac Giang Province, (VN)	(72) Inventor: NGUYEN, Van Chanh Bac Giang Province, (VN) (74) Representative: Herrero & Asociados, S.L.  Cedaceros, 1 28014 Madrid 28014 Madrid (ES)