(19)

(11)

EP 4 139 493 A1

(12)

(43) Date of publication: 01.03.2023 Bulletin 2023/09 (21) Application number: 20853574.0 (22) Date of filing: 22.12.2020

(51) International Patent Classification (IPC):  C21D 8/06(2006.01) C22C 38/00(2006.01) C22C 38/04(2006.01) C22C 38/08(2006.01) C22C 38/14(2006.01) C22C 38/38(2006.01) C21D 9/52(2006.01) C22C 38/02(2006.01) C22C 38/06(2006.01) C22C 38/12(2006.01) C22C 38/16(2006.01) (52) Cooperative Patent Classification (CPC): C21D 8/065; C21D 9/525; C21D 2211/005; C21D 2211/002; C21D 2211/008; C21D 2211/001; C22C 38/06; C22C 38/002; C22C 38/12; C22C 38/16; C22C 38/08; C22C 38/001; C22C 38/14; C22C 38/02; C22C 38/38; C22C 38/04 (86) International application number: PCT/IB2020/062320 (87) International publication number: WO 2021/214538 (28.10.2021 Gazette 2021/43)

(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: 20.04.2020 PL 43360720 (71) Applicant: CMC POLAND SP.Z O.O. 42-400 Zawiercie (PL)	(72) Inventor: KUTYLA, Zbigniew deceased (PL) (74) Representative: Godlewski, Piotr  JWP Rzecznicy Patentowi Dorota Rzazewska sp.k. Sienna Center ul. Zelazna 28/30 00-833 Warszawa 00-833 Warszawa (PL)