ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,484,672, issued on Dec. 2, was assigned to Xue Du (Xuzhou, China).
"Mechanical wallet" was invented by Risheng Li (Guiping, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a mechanical wallet or a card holder, which includes a sliding platform panel, a sliding groove bottom plate, a top cover, and a step rod. The sliding platform panel and the sliding groove bottom plate form a pair of sliding rails that can move up and down. The step rod is provided in the sliding platform panel and the sliding groove bottom plate and can rotate. The top cover is provided on the sliding rails composed by the sliding platform panel a...