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(11)

EP 4 816 857 A1

(12)

(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24898556.6 (22) Date of filing: 22.11.2024

(51) International Patent Classification (IPC):  G02B 5/23(2006.01) G02C 7/10(2006.01) G02B 25/00(2006.01) G02B 5/26(2006.01) B29D 11/00(2006.01) G02C 7/12(2006.01) G02B 27/28(2006.01) G02B 5/30(2006.01) (52) Cooperative Patent Classification (CPC): G02C 7/104; G02C 7/12 (86) International application number: PCT/US2024/057119 (87) International publication number: WO 2025/117381 (05.06.2025 Gazette 2025/23)

(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: GE KH MA MD TN (30) Priority: 30.11.2023 US 202363604465 P (71) Applicant: Enchroma, Inc. Berkeley, California 94704 (US)	(72) Inventors: MCPHERSON, Donald M. Oakland, California 94602 (US) ELLICOCK, JR., Roger William Berkeley, California 94703 (US) KOOVAKKAT, Sunil K. Hercules, California 94647 (US) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)