(19)

(11)

EP 4 815 796 A1

(12)

(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24866657.0 (22) Date of filing: 29.11.2024

(51) International Patent Classification (IPC):  A47L 9/10(2006.01) (52) Cooperative Patent Classification (CPC): A47L 9/1683; A47L 9/106; A47L 9/108 (86) International application number: PCT/GB2024/052999 (87) International publication number: WO 2025/114719 (05.06.2025 Gazette 2025/23)

(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: GE KH MA MD TN (30) Priority: 30.11.2023 CN 202311625059 (71) Applicant: Grey Technology Limited Warndon, Worcester WR4 9FB (GB)	(72) Inventors: GREY, Nicholas Gerald Worcester, WR4 9FB (GB) LI, Shangjie Ningbo, Zhejiang 315505 (CN) CHENG, Mingxin Ningbo, Zhejiang 315505 (CN) (74) Representative: Stevens Hewlett & Perkins  First Floor St Bartholomew's House Lewins Mead Bristol BS1 2NH Bristol BS1 2NH (GB)