ALEXANDRIA, Va., July 21 -- United States Patent no. D1,135,449, issued on July 21, was assigned to Hebei Jishen trading Co. LTD (Shijiazhuang, China).
"Sleeping mat" was invented by Xiaohui Liu (Shijiazhuang, China).
The patent was filed on Oct. 24, 2023, under Application No. D/905,619.
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