(19)

(11)

EP 3 784 822 A1

(12)

(43) Date of publication: 03.03.2021 Bulletin 2021/09 (21) Application number: 19716434.6 (22) Date of filing: 12.04.2019

(51) International Patent Classification (IPC):  C25D 5/56(2006.01) C23C 18/30(2006.01) C23C 18/38(2006.01) C23C 18/48(2006.01) C23C 18/20(2006.01) C23C 18/32(2006.01) C23C 18/42(2006.01) (86) International application number: PCT/EP2019/059459 (87) International publication number: WO 2019/206682 (31.10.2019 Gazette 2019/44)

(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: 24.04.2018 EP 18168933 (71) Applicant: CSEM Centre Suisse d'Electronique et de Microtechnique SA - Recherche et Développement 2002 Neuchâtel (CH)	(72) Inventor: ANDREATTA, Gaëlle 2000 Neuchâtel (CH) (74) Representative: e-Patent SA  Rue Saint-Honoré 1 Boîte Postale CP 2510 2001 Neuchâtel 2001 Neuchâtel (CH)