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(11)

EP 4 069 878 A1

(12)

(43) Date of publication: 12.10.2022 Bulletin 2022/41 (21) Application number: 20897173.9 (22) Date of filing: 30.11.2020

(51) International Patent Classification (IPC):  C22C 37/08(2006.01) C22C 33/08(2006.01) C21C 1/08(2006.01) C22C 37/10(2006.01) (52) Cooperative Patent Classification (CPC): C21C 1/105; C22C 33/08; C22C 37/08; C22C 37/10; C22C 33/04 (86) International application number: PCT/SE2020/051145 (87) International publication number: WO 2021/112744 (10.06.2021 Gazette 2021/23)

(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: 05.12.2019 SE 1951404 (71) Applicant: AB Bruzaholms Bruk 570 34 Bruzaholm (SE)	(72) Inventors: BORGSTRÖM, Henrik 553 22 Jönköping (SE) VIRTANEN, Stefan 571 94 Nässjö (SE) KARLSSON, Hans 570 34 Bruzaholm (SE) JOHANSSON, Sören 570 34 Bruzaholm (SE) (74) Representative: Kransell & Wennborg KB  P.O. Box 27834 115 93 Stockholm 115 93 Stockholm (SE)