(19)

(11)

EP 4 313 487 A1

(12)

(43) Date of publication: 07.02.2024 Bulletin 2024/06 (21) Application number: 22715410.1 (22) Date of filing: 30.03.2022

(51) International Patent Classification (IPC):  B24C 9/00(2006.01) B08B 15/00(2006.01) B24C 3/28(2006.01) B08B 15/02(2006.01) (52) Cooperative Patent Classification (CPC): B24C 9/003; B24C 3/28; B33Y 40/20; B08B 15/002; B08B 15/023 (86) International application number: PCT/SE2022/050313 (87) International publication number: WO 2022/211714 (06.10.2022 Gazette 2022/40)

(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: 01.04.2021 SE 2150418 (71) Applicant: AM Efficiency Nordic AB 59330 Västervik (SE)	(72) Inventor: QVIBERG, Ulf 59338 Västervik (SE) (74) Representative: Zacco Sweden AB  P.O. Box 5581 Löjtnantsgatan 21 114 85 Stockholm 114 85 Stockholm (SE)