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(11)

EP 4 077 741 A1

(12)

(43) Date of publication: 26.10.2022 Bulletin 2022/43 (21) Application number: 20842697.3 (22) Date of filing: 18.12.2020

(51) International Patent Classification (IPC):  C21D 1/04(2006.01) B06B 1/20(2006.01) C21D 1/613(2006.01) F27D 9/00(2006.01) F28B 1/06(2006.01) B21D 37/16(2006.01) C21D 1/76(2006.01) C22F 1/00(2006.01) F28F 13/10(2006.01) B21D 22/02(2006.01) C23C 2/06(2006.01) B06B 1/00(2006.01) C21D 1/09(2006.01) F27B 9/12(2006.01) F27D 15/02(2006.01) F28F 1/00(2006.01) G10K 1/00(2006.01) C21D 9/00(2006.01) C22F 1/02(2006.01) C21D 7/13(2006.01) B21D 28/00(2006.01) (52) Cooperative Patent Classification (CPC): C21D 7/13; C21D 9/48; C21D 1/04; C21D 1/09; C21D 1/613; B21D 37/16; C21D 1/76; C21D 9/0056; C22F 1/02; F28F 13/10; C23C 2/06; C23C 2/12; C23C 2/26; F28C 3/005; F28D 1/06; F28D 2021/0077; F28D 2021/0078; B21D 22/022 (86) International application number: PCT/EP2020/087102 (87) International publication number: WO 2021/123225 (24.06.2021 Gazette 2021/25)

(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: 20.12.2019 SE 1951533 (71) Applicant: AUTOTECH ENGINEERING S.L. 48340 Amorebieta-Etxano, Bizkaia (ES)	(72) Inventor: PALO, Daniel 974 43 Luleå (SE) (74) Representative: Ehrner & Delmar Patentbyrå AB  Götgatan 78 118 30 Stockholm 118 30 Stockholm (SE)