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EP 4 337 034 A1

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(43) Date of publication: 20.03.2024 Bulletin 2024/12 (21) Application number: 22807893.7 (22) Date of filing: 13.05.2022

(51) International Patent Classification (IPC):  A24C 5/18(2006.01) A24D 1/04(2006.01) A24F 40/46(2020.01) A24F 40/10(2020.01) A24B 15/167(2020.01) A24D 1/20(2020.01) A24D 1/02(2006.01) A24F 40/50(2020.01) A24F 40/20(2020.01) (52) Cooperative Patent Classification (CPC): A24B 15/167; A24D 1/20; A24C 5/01; A24B 15/16 (86) International application number: PCT/KR2022/006912 (87) International publication number: WO 2022/240246 (17.11.2022 Gazette 2022/46)

(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: 14.05.2021 KR 20210063009 (71) Applicant: KT & G Corporation Daejeon 34337 (KR)

(72) Inventors: LEE, Ju Hwan Yeongju-si Gyeongsangbuk-do 36137 (KR) KIM, Jeong Hoo Cheongju-si Chungcheongbuk-do 28627 (KR) KIM, Min Kyu Seoul 08211 (KR) KIM, Jung Ho Seoul 02551 (KR) PARK, Ju Eon Seoul 07630 (KR) LEE, Jong Sub Seoul 06176 (KR) CHO, Byung Sung Gwangmyeong-si Gyeonggi-do 14241 (KR) HAN, Jung Ho Daejeon 34021 (KR) (74) Representative: Ter Meer Steinmeister & Partner  Patentanwälte mbB Nymphenburger Straße 4 80335 München 80335 München (DE)