ALEXANDRIA, Va., July 21 -- United States Patent no. D1,136,431, issued on July 21, was assigned to Shenzhen fourth quadrant technology Co. LTD. (Shenzhen, China).
"Vacuum cleaner" was invented by Bo Tan (Changde, China).
The patent was filed on Jan. 17, 2025, under Application No. D/986,657.
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