ALEXANDRIA, Va., June 25 -- United States Patent no. 12,337,441, issued on June 24.
"Socket structure" was invented by Yi-Fu Chen (Taichung, Taiwan) and He-Qian Chen (Taichung, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A socket includes a first section and a second section. The first section is to be connected with a tool. The second section includes an outer face, and a mounting hole is axially defined through the second section and communicates through the first section. The mounting hole includes multiple recesses and multiple sides defined in the inner periphery thereof. The multiple recesses and the multiple sides are located alternatively with each other. Each recess includes a rounded corn...