ALEXANDRIA, Va., Sept. 17 -- United States Patent no. D1,093,747, issued on Sept. 16, was assigned to ANHUI HENGYU OPTICAL ELECTRONICS Co. LTD. (Hefei, China).
"Protective mask" was invented by Haijian Sun (Hefei, China).
The patent was filed on Aug. 4, 2023, under Application No. D/909,425.
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