ALEXANDRIA, Va., Oct. 21 -- United States Patent no. D1,154,136, issued on Oct. 20, was assigned to Shenzhen Yizhan Hongyun Technology Co. Ltd. (Shenzhen, China).
"Adjustable height step stool" was invented by Yiping Hu (Shenzhen, China).
The patent was filed on March 21, 2025, under Application No. D/994,705.
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