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(11)

EP 4 558 465 A1

(12)

(43) Date of publication: 28.05.2025 Bulletin 2025/22 (21) Application number: 23748965.3 (22) Date of filing: 21.07.2023

(51) International Patent Classification (IPC):  C04B 35/20(2006.01) B22D 41/02(2006.01) C04B 35/66(2006.01) C21B 13/00(2006.01) C04B 35/63(2006.01) B22D 11/10(2006.01) B22D 41/50(2006.01) C04B 35/80(2006.01) C21C 5/00(2006.01) C04B 35/632(2006.01) (52) Cooperative Patent Classification (CPC): C04B 35/66; C04B 35/20; C04B 2235/3206; C04B 2235/3445; C04B 2235/3217; C04B 2235/3222; C04B 35/80; C04B 2235/3272; C04B 2235/3208; B22D 41/02; B22D 41/50; C04B 2235/9676; C04B 2235/96; C04B 2235/80; C04B 35/6306; C04B 35/6316; C04B 2235/3427; C04B 2235/3201; C04B 35/6309; C04B 35/6313; C04B 35/632; C04B 2235/3409; C04B 2235/447; C04B 2235/448; C21C 5/44; B22D 41/54; B22D 11/103 (86) International application number: PCT/EP2023/070341 (87) International publication number: WO 2024/018074 (25.01.2024 Gazette 2024/04)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (30) Priority: 21.07.2022 TW 111127378 (71) Applicant: Calderys France 51120 Sézanne (FR)	(72) Inventor: SUN, Cheng-Hsien Pingtung County, 906 (TW) (74) Representative: Haseltine Lake Kempner LLP  One Portwall Square Portwall Lane Bristol BS1 6BH Bristol BS1 6BH (GB)