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(11)

EP 4 121 608 A1

(12)

(43) Date of publication: 25.01.2023 Bulletin 2023/04 (21) Application number: 21715765.0 (22) Date of filing: 15.03.2021

(51) International Patent Classification (IPC):  E03F 5/16(2006.01) C02F 9/00(2006.01) B01D 24/00(2006.01) (52) Cooperative Patent Classification (CPC): C02F 1/001; C02F 1/281; C02F 3/327; C02F 2103/001; C02F 2301/043; E03F 5/16; C02F 2303/24 (86) International application number: PCT/US2021/022354 (87) International publication number: WO 2021/188430 (23.09.2021 Gazette 2021/38)

(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: 20.03.2020 US 202062992820 P 01.04.2020 US 202016837010 (71) Applicant: Advanced Drainage Systems, Inc. Hilliard, OH 43026 (US)	(72) Inventors: FIGOLA, Daniel J. Hilliard, Ohio 43026 (US) LIU, Bo Hilliard, Ohio 43026 (US) PANK, Thomas E. Hilliard, Ohio 43026 (US) VITARELLI, Ronald R. Hilliard, Ohio 43026 (US) HARTWELL, Erik K. Hilliard, Ohio 43026 (US) (74) Representative: Finnegan Europe LLP  1 London Bridge London SE1 9BG London SE1 9BG (GB)