(19)

(11)

EP 4 017 838 A1

(12)

(43) Date of publication: 29.06.2022 Bulletin 2022/26 (21) Application number: 19942372.4 (22) Date of filing: 20.11.2019

(51) International Patent Classification (IPC):  C04B 18/04(2006.01) C04B 28/04(2006.01) (52) Cooperative Patent Classification (CPC): C04B 28/02; Y02W 30/91   C-Sets: C04B 28/02, C04B 14/06, C04B 18/0409, C04B 18/06, C04B 18/08, C04B 20/0076; (86) International application number: PCT/IN2019/050858 (87) International publication number: WO 2021/033193 (25.02.2021 Gazette 2021/08)

(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: 22.08.2019 IN 201911033876 (71) Applicant: Hindalco Industries Ltd Sonbhadra District 231217 (IN)	(72) Inventors: JAJOO, Satish Narain District Sonbhadra 231217 (IN) SAINI, Rajesh Kumar District Sonbhadra 231218 (IN) PANDEY, Anil Kumar District Sonbhadra 231218 (IN) (74) Representative: Graf von Stosch Patentanwaltsgesellschaft mbH  Prinzregentenstraße 22 80538 München 80538 München (DE)