(19)

(11)

EP 4 117 859 A1

(12)

(43) Date of publication: 18.01.2023 Bulletin 2023/03 (21) Application number: 20711571.8 (22) Date of filing: 12.03.2020

(51) International Patent Classification (IPC):  B24D 3/00(2006.01) B24D 11/00(2006.01) B24D 18/00(2006.01) (52) Cooperative Patent Classification (CPC): B24D 3/004; B24D 18/0018; B24D 11/001; B24D 3/346; B24D 9/08 (86) International application number: PCT/EP2020/056696 (87) International publication number: WO 2021/180328 (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 (71) Applicant: KGS Diamond Group S.A. 1618 Châtel-St.-Denis (CH)	(72) Inventor: FERRONATO, Sandro Giovanni Giuseppe Dubai (AE) (74) Representative: Nederlandsch Octrooibureau  P.O. Box 29720 2502 LS The Hague 2502 LS The Hague (NL)