ALEXANDRIA, Va., July 28 -- United States Patent no. D1,136,488, issued on July 28, was assigned to Birkenstock IP GmbH (Linz am Rhein, Germany).

"Mule" was invented by Parthasarathee Behura (Linz am Rhein, Germany).

The patent was filed on Nov. 19, 2025, under Application No. D/033,629.

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