(19)

(11)

EP 3 762 950 A1

(12)

(43) Date of publication: 13.01.2021 Bulletin 2021/02 (21) Application number: 19764725.8 (22) Date of filing: 07.03.2019

(51) International Patent Classification (IPC):  H01B 12/10(2006.01) H01L 39/12(2006.01) H01B 12/06(2006.01) H01L 39/24(2006.01) (86) International application number: PCT/US2019/021156 (87) International publication number: WO 2019/173593 (12.09.2019 Gazette 2019/37)

(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: 07.03.2018 US 201862639530 P (71) Applicant: H. C. Starck Inc Newton, MA 02461 (US)	(72) Inventors: SMATHERS, David, B. Columbus, OH 43221 (US) AIMONE, Paul Bridgewater, MA 02324 (US) (74) Representative: Maiwald Patent- und Rechtsanwaltsgesellschaft mbH  Elisenhof Elisenstraße 3 80335 München 80335 München (DE)