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EP 4 554 414 A1

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(43) Date of publication: 21.05.2025 Bulletin 2025/21 (21) Application number: 23801668.7 (22) Date of filing: 13.07.2023

(51) International Patent Classification (IPC):  A24F 40/05(2020.01) B06B 1/02(2006.01) A24F 40/10(2020.01) H03K 17/081(2006.01) A24F 40/30(2020.01) A24F 40/50(2020.01) A24F 40/42(2020.01) B06B 1/20(2006.01) H03K 17/687(2006.01) (52) Cooperative Patent Classification (CPC): A24F 40/05; A24F 40/10; A24F 40/50; H03K 17/08142; B06B 1/0238; B06B 2201/77 (86) International application number: PCT/KR2023/095032 (87) International publication number: WO 2024/014945 (18.01.2024 Gazette 2024/03)

(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: 15.07.2022 KR 20220087476 28.10.2022 KR 20220141490 (71) Applicant: KT&G Corporation Daedeok-gu Daejeon 34337 (KR)	(72) Inventors: SEO, Jangwon Daejeon 34023 (KR) GO, Gyung Min Daejeon 35207 (KR) JANG, Chul Ho Bucheon-si, Gyeonggi-do 14725 (KR) JUNG, Jin Chul Daejeon 34079 (KR) (74) Representative: Ter Meer Steinmeister & Partner  Patentanwälte mbB Nymphenburger Straße 4 80335 München 80335 München (DE)