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EP 4 456 747 A1

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(43) Date of publication: 06.11.2024 Bulletin 2024/45 (21) Application number: 22854507.5 (22) Date of filing: 28.12.2022

(51) International Patent Classification (IPC):  A24F 40/20(2020.01) A24F 40/485(2020.01) A24F 40/40(2020.01) (52) Cooperative Patent Classification (CPC): A24F 40/20; A24F 40/485; A24F 40/40 (86) International application number: PCT/CN2022/142889 (87) International publication number: WO 2023/125680 (06.07.2023 Gazette 2023/27)

(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: 31.12.2021 CN 202123451140 U (71) Applicant: Shenzhen Huabao Collaborative Innovation Technology Research Institute Co., Ltd. Shenzhen, Guangdong 518100 (CN)

(72) Inventors: LI, Siwen Shenzhen, Guangdong 518100 (CN) FU, Xiaosong Shenzhen, Guangdong 518100 (CN) TANG, Zhiqiang Shenzhen, Guangdong 518100 (CN) LI, Zhengyong Shenzhen, Guangdong 518100 (CN) WANG, Xiaobo Shenzhen, Guangdong 518100 (CN) MIAO, Jinbo Shenzhen, Guangdong 518100 (CN) RONG, Hui Shenzhen, Guangdong 518100 (CN) JIN, Xiaochi Shenzhen, Guangdong 518100 (CN) (74) Representative: Herrero & Asociados, S.L.  Edificio Aqua - Agustín de Foxá, 4-10 28036 Madrid 28036 Madrid (ES)