ALEXANDRIA, Va., Aug. 5 -- United States Patent no. D1,139,731, issued on Aug. 4, was assigned to Jiangsu Dongdeli New Material Technology Co. Ltd. (Nantong, China).
"Sand-filled gravity ball" was invented by Dongpo Lv (Nantong, China), Yuling Guo (Nantong, China) and Tao Wang (Nantong, China).
The patent was filed on Jan. 17, 2025, under Application No. D/986,617.
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