ALEXANDRIA, Va., March 31 -- United States Patent no. 12,589,417, issued on March 31, was assigned to Andreas Stihl AG & Co. KG (Waiblingen, Germany).
"Pressure washer" was invented by Simon Trinkle (Kaisersbach, Germany), Michael Renz (Stuttgart, Germany) and Christopher Tost (Auenwald, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A pressure washer has a connection for a source of liquid; a high pressure pump; a main line by way of which liquid via the high pressure pump is conveyable from the connection to a spray opening of the main line; and a supplemental pump for adding an additive to the liquid. The pressure washer is conceived in such a way that the additive by way of the supplemental pump ...