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(11)

EP 4 418 914 A1

(12)

(43) Date of publication: 28.08.2024 Bulletin 2024/35 (21) Application number: 22883863.7 (22) Date of filing: 12.10.2022

(51) International Patent Classification (IPC):  A24F 40/46(2020.01) A24F 40/50(2020.01) H02M 1/00(2006.01) A24D 1/20(2020.01) A24F 40/53(2020.01) A24F 40/51(2020.01) A24F 40/60(2020.01) A24F 40/57(2020.01) A24F 40/20(2020.01) A24F 40/30(2020.01) (52) Cooperative Patent Classification (CPC): A24D 1/20; A24F 40/20; A24F 40/46; A24F 40/50; A24F 40/51 (86) International application number: PCT/KR2022/015430 (87) International publication number: WO 2023/068640 (27.04.2023 Gazette 2023/17)

(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: 19.10.2021 KR 20210139798 10.03.2022 KR 20220030272 (71) Applicant: KT & G Corporation Daejeon 34337 (KR)	(72) Inventor: PARK, Sangkyu Seoul 05281 (KR) (74) Representative: Schornack, Oliver  Wuesthoff & Wuesthoff Patentanwälte und Rechtsanwalt PartG mbB Schweigerstraße 2 81541 München 81541 München (DE)