ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,978, issued on April 7, was assigned to SANNWSG INC (Dover, Del.).
"Expandable platform cart" was invented by Qingyun Zhang (Dover, Del.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to an expandable platform cart, the core of which comprises a frame, a double-tier load-bearing platform, and an extension system. The double-tier platform supports categorized storage: the lower tier holds heavy items to lower the center of gravity, while the upper tier stores lightweight items; an X-shaped telescopic frame features a linked folding mechanism, allowing volume reduction for transport in a single step. An extension plate a...