ALEXANDRIA, Va., Nov. 3 -- United States Patent no. 12,780,279, issued on Nov. 3.
"Portable folding wagon" was invented by Chaoyang Gao (Wuyi County, China) and Zhenen Gao (Wuyi County, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a portable folding wagon, including a carrying plate provided with a lifting part, a connecting rod fixed on a pressing plate, a caster rotatably mounted on the connecting rod by a wheel frame, a turnover limiting member slidably mounted on the connecting rod and limiting the caster to rotate on the connecting rod by a concave-convex cooperating structure, a first spring elastically acting on the turnover limiting member to attach to the caster, a torsion sprin...