ALEXANDRIA, Va., Aug. 5 -- United States Patent no. D1,138,424, issued on Aug. 4, was assigned to SIDIZ INC. (Pyeongtaek-si, South Korea).
"Chair backrest" was invented by Chi Gwan Oh (Goyang-si, South Korea).
The patent was filed on Feb. 26, 2025, under Application No. D/991,103.
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