ALEXANDRIA, Va., June 2 -- United States Patent no. 12,644,162, issued on June 2, was assigned to EJOT SE & Co. KG (Bad Berleburg, Germany).
"Method for producing a screw, and screw" was invented by Ralph J. Hellmig (Bad Laasphe, Germany), Michael Achenbach (Breidenbach, Germany) and Fabian Simonsen (Erfurt, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a method for producing a screw, having the following steps: (a) rolling a screw wire made of low-alloy carbon steel to produce screw (10) having a thread; (b) heating the entire screw (10) to an austenitizing temperature under a carbon atmosphere and/or nitrogen atmosphere and maintaining the temperature; (c) quenching the en...