(19)

(11)

EP 3 956 104 A1

(12)

(43) Date of publication: 23.02.2022 Bulletin 2022/08 (21) Application number: 20717307.1 (22) Date of filing: 25.03.2020

(51) International Patent Classification (IPC):  B24D 3/28(2006.01) B24D 18/00(2006.01) B24D 3/34(2006.01) (52) Cooperative Patent Classification (CPC): B24D 18/0072; B24D 3/28; B24D 3/344 (86) International application number: PCT/IB2020/052812 (87) International publication number: WO 2020/212779 (22.10.2020 Gazette 2020/43)

(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: 16.04.2019 US 201962834745 P (71) Applicant: 3M Innovative Properties Company Saint Paul, Minnesota 55133-3427 (US)	(72) Inventors: SORENSON, Gregory P. Saint Paul, Minnesota 55133-3427 (US) GORODISHER, Ilya Saint Paul, Minnesota 55133-3427 (US) THURBER, Ernest L. Saint Paul, Minnesota 55133-3427 (US) NELSON, Thomas J. Saint Paul, Minnesota 55133-3427 (US) (74) Representative: Mathys & Squire  Theatinerstraße 7 80333 München 80333 München (DE)