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EP 4 188 646 A1

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(43) Date of publication: 07.06.2023 Bulletin 2023/23 (21) Application number: 21746166.4 (22) Date of filing: 20.07.2021

(51) International Patent Classification (IPC):  B24D 3/28(2006.01) B24D 11/00(2006.01) B24D 3/34(2006.01) (52) Cooperative Patent Classification (CPC): B24D 3/28; B24D 3/344; B24D 11/001; B24D 11/005 (86) International application number: PCT/IB2021/056544 (87) International publication number: WO 2022/023879 (03.02.2022 Gazette 2022/05)

(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: 28.07.2020 US 202063057679 P (71) Applicant: 3M Innovative Properties Company Saint Paul, Minnesota 55133-3427 (US)

(72) Inventors: THURBER, Ernest L. Saint Paul, Minnesota 55133-3427 (US) SORENSON, Gregory P. Saint Paul, Minnesota 55133-3427 (US) GORODISHER, Ilya Saint Paul, Minnesota 55133-3427 (US) NELSON, Thomas J. Saint Paul, Minnesota 55133-3427 (US) LI, Junting Saint Paul, Minnesota 55133-3427 (US) LENTZ, Daniel M. Saint Paul, Minnesota 55133-3427 (US) (74) Representative: De Clercq & Partners  Edgard Gevaertdreef 10a 9830 Sint-Martens-Latem 9830 Sint-Martens-Latem (BE)