ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,416, issued on March 31, was assigned to Andreas Stihl AG & Co. KG (Waiblingen, Germany).
"Pressure washer apparatus" was invented by Simon Trinkle (Kaisersbach, Germany), Christopher Tost (Auenwald, Germany), Richard Fresow (Remseck, Germany), Lukas Zuercher (Ludwigsburg, Germany) and Michael Renz (Stuttgart, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pressure washer includes a main line through which, via a high-pressure pump, liquid can be conveyed to a spray opening, and a main valve. The main valve, when in a closed state, prevents liquid from flowing through the main line and, when in an open state, allows liquid to flow through...