ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,397,838, issued on Aug. 26.
"Cart" was invented by Gregory Dean Shipman (Richland, Wash.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a cart comprising a retaining frame assembly configured to support and retain a door in a vertical position, the retaining frame assembly comprising a base support frame and side support members coupled to the base support frame. In certain embodiments, the cart may further comprise a wheel assembly including a front wheel and a rear wheel assembly, wherein the front wheel assembly comprises a single swivel wheel coupled to a bottom side of the retaining frame assembly, wherein the rear wheel assembly compr...