ALEXANDRIA, Va., Feb. 3 -- United States Patent no. D1,111,252, issued on Feb. 3, was assigned to 3M Innovative Properties Co. (St. Paul, Minn.).
"Welding helmet" was invented by Thomas B. Stenvall (Sundborn, Sweden), Mats A. Reshagen (Dala-Floda, Sweden), Mats S. G. Svensson (Borlange, Sweden) and Hans E. Nystrom (Vallingby, Sweden).
The patent was filed on Sept. 11, 2023, under Application No. D/911,879.
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