(19)

(11)

EP 3 891 344 A1

(12)

(43) Date of publication: 13.10.2021 Bulletin 2021/41 (21) Application number: 19891808.8 (22) Date of filing: 03.12.2019

(51) International Patent Classification (IPC):  E03D 11/10(2006.01) E03D 11/18(2006.01) F16K 7/06(2006.01) (52) Cooperative Patent Classification (CPC): E03D 11/10; F16K 7/06; E03D 11/18 (86) International application number: PCT/VN2019/000020 (87) International publication number: WO 2020/118323 (11.06.2020 Gazette 2020/24)

(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: 03.12.2018 VN 201805422 (71) Applicants: Nguyen Van Nam Ho Chi Minh (VN) Nguyen, Nhat Quang District 1 Ho Chi Minh (VN)	(72) Inventors: Nguyen Van Nam Ho Chi Minh (VN) Nguyen, Nhat Quang District 1 Ho Chi Minh (VN) (74) Representative: Marri, Luca et al Dragotti & Associati S.r.l. Via Paris Bordone, 9 31100 Treviso 31100 Treviso (IT)