ALEXANDRIA, Va., May 26 -- United States Patent no. 12,636,573, issued on May 26, was assigned to Dongguan Hongyu Plastic Co. Ltd. (Dongguan, China).
"Tetra-link chess" was invented by Juying Shi (Dongguan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A tetra-link chess includes two base frames, a plurality of mounting plates, a plurality of pieces and a baffle, the two base frames are symmetrically erected on the ground, the plurality of mounting plates are stacked along a vertical direction, two ends of each mounting plate are respectively connected to the two base frames, each mounting plate is configured with an accommodation groove configured to accommodate the plurality of pieces, the accommoda...