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(11)

EP 4 423 022 A1

(12)

(43) Date of publication: 04.09.2024 Bulletin 2024/36 (21) Application number: 22817341.5 (22) Date of filing: 31.10.2022

(51) International Patent Classification (IPC):  C02F 1/463(2023.01) C02F 1/461(2023.01) (52) Cooperative Patent Classification (CPC): C02F 1/463; C02F 1/46109; C02F 2201/006; C02F 2201/007 (86) International application number: PCT/IB2022/060484 (87) International publication number: WO 2023/073666 (04.05.2023 Gazette 2023/18)

(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 (30) Priority: 30.10.2021 PT 2021117537 (71) Applicant: Ventiláqua, S.A 3040-575 Antanhol (PT)	(72) Inventors: DOS SANTOS RODRIGUES, António José 2415-754 LEIRIA (PT) MELES FREIRE DE OLIVEIRA, Carlos Miguel 3000-036 COIMBRA (PT) (74) Representative: Patentree  Edificio Net Rua de Salazares, 842 4149-002 Porto 4149-002 Porto (PT)