(19)

(11)

EP 4 515 170 A2

(12)

(88) Date of publication A3: 21.11.2024 (43) Date of publication: 05.03.2025 Bulletin 2025/10 (21) Application number: 23921577.5 (22) Date of filing: 10.04.2023

(51) International Patent Classification (IPC):  F41A 1/08(2006.01) F41A 3/64(2006.01) F41A 19/26(2006.01) F41A 19/43(2006.01) F41A 3/54(2006.01) F41A 3/40(2006.01) F41A 5/02(2006.01) F41A 19/27(2006.01) F41A 19/59(2006.01) (52) Cooperative Patent Classification (CPC): F41A 19/43; F41A 19/59; F41A 19/26; F41A 19/27; F41A 5/02; F41A 3/64; F41A 3/40; F41A 1/08; F41A 3/54 (86) International application number: PCT/US2023/018059 (87) International publication number: WO 2024/186323 (12.09.2024 Gazette 2024/37)

(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: 29.04.2022 US 202217661499 (71) Applicant: Zhisong, Huang Fremont, CA 94539 (US)	(72) Inventor: Zhisong, Huang Fremont, CA 94539 (US) (74) Representative: Mathys & Squire  The Shard 32 London Bridge Street London SE1 9SG London SE1 9SG (GB)