(19)

(11)

EP 4 118 471 A1

(12)

(43) Date of publication: 18.01.2023 Bulletin 2023/03 (21) Application number: 21712461.9 (22) Date of filing: 11.03.2021

(51) International Patent Classification (IPC):  G02B 6/02(2006.01) G02B 6/036(2006.01) F21K 2/04(2006.01) (52) Cooperative Patent Classification (CPC): G02B 6/02042; G02B 6/02323; G02B 6/02333; G02B 6/03605; G02B 6/03633; F21K 2/04; C09K 11/7706; C09K 11/77062; C03C 4/12; C03C 25/1061 (86) International application number: PCT/EP2021/056230 (87) International publication number: WO 2021/180866 (16.09.2021 Gazette 2021/37)

(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: 12.03.2020 CH 2832020 (71) Applicant: Triangle Resource Holding AG 6330 Cham (CH)	(72) Inventors: WEIDMANN, Urs 6330 Cham (CH) LOUIS, Thomas André 8957 Spreitenbach (CH) KUNTE, Stephan 6333 Hünenberg See (CH) ROMANO, Valerio 4500 Solothurn (CH) PILZ, Sönke Hendrik 3007 Bern (CH) (74) Representative: Troesch Scheidegger Werner AG  Schwäntenmos 14 8126 Zumikon 8126 Zumikon (CH)