ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,453, issued on April 7, was assigned to Duoming Zhong (Heyuan, China).
"Weight-adjustable dumbbell" was invented by Chun Jiang (Neijiang City, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A weight-adjustable dumbbell includes a handle and counterweight block groups. The counterweight block groups include main counterweight blocks and auxiliary counterweight blocks. The main counterweight blocks are fixedly connected to two ends of the handle. One side of each auxiliary counterweight block is provided with a boss. Two ends of the boss are provided with fan-shaped convex blocks arranged correspondingly. One side of each auxiliary counterweight...