(19)

(11)

EP 4 680 577 A1

(12)

(43) Date of publication: 21.01.2026 Bulletin 2026/04 (21) Application number: 23722030.6 (22) Date of filing: 17.03.2023

(51) International Patent Classification (IPC):  C02F 1/46(2023.01) C02F 1/00(2023.01) C02F 1/461(2023.01) C02F 1/48(2023.01) C02F 9/20(2023.01) (52) Cooperative Patent Classification (CPC): C02F 1/4602; C02F 1/481; C02F 1/003; C02F 2201/006; C02F 9/20; C02F 1/4606; C02F 1/46109; C02F 1/46176; C02F 2001/46138; C02F 2001/46152; C02F 2307/14; C02F 2201/003 (86) International application number: PCT/IB2023/052633 (87) International publication number: WO 2024/194667 (26.09.2024 Gazette 2024/39)

(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 ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: KH MA MD TN (71) Applicant: Caleffi S.p.A. 28010 Fontaneto d'Agogna (NO) (IT)	(72) Inventor: CALEFFI, Marco 28010 Fontaneto D'Agogna (NO) (IT) (74) Representative: Luppi Intellectual Property S.r.l.  Viale Corassori, 54 41124 Modena 41124 Modena (IT)