ALEXANDRIA, Va., April 21 -- United States Patent no. D1,122,628, issued on April 21, was assigned to Wella Operations US LLC (Calabasas, Calif.).

"Brush stem" was invented by Natalie Genna (Burbank, Calif.) and Paolo Tarabotti (Milan).

The patent was filed on Aug. 15, 2023, under Application No. D/910,074.

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