ALEXANDRIA, Va., July 15 -- United States Patent no. D1,131,960, issued on June 23, was assigned to BEIJING ROBOROCK TECHNOLOGY Co. LTD. (Beijing).
"Dust filter for cleaning appliance" was invented by Baokui Zhang (Beijing) and Haozhe Zhang (Beijing).
The patent was filed on Aug. 8, 2024, under Application No. D/522,311.
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