ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,134, issued on Dec. 30.
"Foldable cart frame" was invented by Zhihua Huang (Guangdong, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention discloses a foldable cart frame, comprising a front frame mechanism, a rear frame mechanism, a collapsing mechanism, a foldable upper connection frame, and a foldable lower support frame; when the front frame mechanism and the rear frame mechanism are pushed to collapse or expand, the foldable upper connection frame and the foldable lower support frame rotate to fold or unfold accordingly, an upper end of the collapsing mechanism slides along the foldable upper connection frame, a lower end...