ALEXANDRIA, Va., June 10 -- United States Patent no. 12,290,022, issued on May 6, was assigned to Andreas Stihl AG & Co. KG (Waiblingen, Germany).
"Trimmer line spool for a trimmer head" was invented by Sebastian Schmidt (Kirchheim a. N., Germany), Simon Haug (Waiblingen, Germany), Sebastian Zappe (Kirchberg an der Murr, Germany), Christoph Brenner (Gartringen, Germany), Achim Rethaber (Fellbach, Germany), Bjorn Petersen (GroBbottwar, Germany) and Stefan Buchner (Nesselwang, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A trimmer line spool has first and second spool chambers for a trimmer line. First and second holder pairs are provided. The first holder pair has first and second trimmer line holde...