ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,539,715, issued on Feb. 3, was assigned to Symbotic LLC (Wilmington, Mass.).
"Autonomous transport vehicle with steering" was invented by Akram Zahdeh (Wilmington, Mass.) and Edward A. MacDonald (Wilmington, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An autonomous transport vehicle, for transporting items in a storage and retrieval system, includes a frame, a controller, at least two independently driven drive wheels mounted to the frame, and at least one caster wheel mounted to the frame and having a castering assistance motor that engages the at least one caster wheel so as to impart castering assistance torque to the at least one caster whee...