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EP 3 566 093 A1

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(43) Date of publication: 13.11.2019 Bulletin 2019/46 (21) Application number: 18708521.2 (22) Date of filing: 15.02.2018

(51) International Patent Classification (IPC):  G02B 27/22(2018.01) G02B 27/01(2006.01) G02B 27/00(2006.01) (86) International application number: PCT/US2018/018432 (87) International publication number: WO 2018/217252 (29.11.2018 Gazette 2018/48)

(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: MA MD TN (30) Priority: 26.05.2017 US 201762511567 P (71) Applicant: Google LLC Mountain View, CA 94043 (US)	(72) Inventors: PERRAULT, John D. Mountain View, California 94043 (US) LLULL, Patrick Mountain View, California 94043 (US) (74) Representative: Maikowski & Ninnemann Patentanwälte Partnerschaft mbB  Postfach 15 09 20 10671 Berlin 10671 Berlin (DE)