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(11)

EP 4 359 838 A1

(12)

(43) Date of publication: 01.05.2024 Bulletin 2024/18 (21) Application number: 22829058.1 (22) Date of filing: 17.06.2022

(51) International Patent Classification (IPC):  G02B 17/08(2006.01) G02B 23/02(2006.01) G02B 13/14(2006.01) G02B 23/06(2006.01) (52) Cooperative Patent Classification (CPC): G02B 23/06; G02B 13/14; G02B 17/0808 (86) International application number: PCT/US2022/033968 (87) International publication number: WO 2022/271546 (29.12.2022 Gazette 2022/52)

(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: 23.06.2021 US 202117356348 (71) Applicant: CSO CO. LTD. Daejeon, 34074 (KR)	(72) Inventor: CHOI, Youngwan Marina del Rey, California 90292-9246 (US) (74) Representative: Ström & Gulliksson AB  Box 5275 102 46 Stockholm 102 46 Stockholm (SE)