ALEXANDRIA, Va., Sept. 24 -- United States Patent no. D1,148,429, issued on Sept. 22, was assigned to Guangzhou Kaitu Environmental Protection Technology Co. Ltd. (Guangzhou, China).
"Ladder step board" was invented by Kai Luo (Guangzhou, China).
The patent was filed on Dec. 5, 2024, under Application No. D/977,139.
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