ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,084, issued on July 29.
"Double-sliding sleeve collapsible folding trailer" was invented by Chenfei Qiao (Jiangsu, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The double-sliding sleeve collapsible folding trailer comprises: a vertical rod assembly, left and right side folding assemblies, a front and rear side folding assembly, a bottom supporting assembly and a wheel assembly; four vertical rods are provided in a rectangular distribution and fixed with upper retaining brackets and lower retaining brackets at both ends, and with linkage sliding sleeves for vertical free sliding; the left and right side folding assemblies, the front and rear ...