(19)

(11)

EP 4 244 539 A1

(12)

(43) Date of publication: 20.09.2023 Bulletin 2023/38 (21) Application number: 21892441.3 (22) Date of filing: 16.11.2021

(51) International Patent Classification (IPC):  F24D 17/00(2022.01) F24D 3/18(2006.01) F24D 19/10(2006.01) F24D 3/08(2006.01) F24D 17/02(2006.01) E03B 7/04(2006.01) (52) Cooperative Patent Classification (CPC): F24D 3/08; F24D 19/1054; F24D 17/0078; E03B 7/045 (86) International application number: PCT/SE2021/051147 (87) International publication number: WO 2022/103323 (19.05.2022 Gazette 2022/20)

(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: 16.11.2020 SE 2051338 (71) Applicant: EnergyBooster AB 663 40 Hammarö (SE)	(72) Inventor: OSSIANSSON, Willy 663 31 Skoghall (SE) (74) Representative: Noréns Patentbyrå AB  Box 10198 100 55 Stockholm 100 55 Stockholm (SE)