ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,992, issued on Sept. 23.
"Trapezoidal nut" was invented by Dmitri Alexandrovich Panfilov (Alexandria, Va.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a trapezoidal nut made of sheet metal, proportionally folded under a bend angle to form two parts, with a threaded hole and spikes on one side and a smooth surface hole on another side. The purpose of the invention is to add the ability to attach any object to a nut without compromising its integrity and general purpose, and reliably use a nut without spontaneous unscrewing and detachment from the mounting plane. The goal is achieved by the fact that the trapezoidal...