ALEXANDRIA, Va., July 16 -- United States Patent no. 12,667,864, issued on June 30, was assigned to USG Umweltservice GmbH & Co. KG (Velbert, Germany).
"Device for separating feed material" was invented by Ferdinand Doppstadt (Velbert, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a device (1) for separating feed material (2) for separating a first fraction (3) comprising moist, slippery, slimy, kneadable, dough-like, cohesive and/or tough soils and/or soil materials, preferably clay-containing or clay-like adhesions, further preferably intended for use in a quarry, with a plurality of rotary elements (4) designed as helical screws, wherein a rotary element (4) has a shaft (...