ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,704,147, issued on Aug. 11, was assigned to NITTOSEIKO Co. LTD. (Kyoto, Japan).
"Stud bolt" was invented by Shingo Torii (Kyoto, Japan), Keiichi Miyata (Kyoto, Japan) and Satoshi Shirahase (Kyoto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A stud bolt to be fixed, in a retained state and a rotation stop state, to a mounting target plate includes a head, a screw shaft portion, a rotation stop portion, an annular groove, and an annular protrusion. The mounting target plate is to be sandwiched between a bearing surface of the head and the annular protrusion. A recessed portion recessed toward an upstream side in a screw advance direction is forme...