ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,925, issued on Sept. 15, was assigned to Ningbo Hyderon Hardware Co. Ltd. (Yuyao, China).
"Door stopper" was invented by Lifeng Zhang (Yuyao, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A door stopper comprising a door stopper head; the door stopper head is configured to be an arc shape, one end of the door stopper head is connected to a door stopper body used for stopping a door body, a spherical groove is formed in the door stopper head, and an anti-slip ball is arranged in the spherical groove; when in use, the anti-slip ball is in contact with the ground such that the anti-slip effect is achieved; friction is produced between the anti-...