ALEXANDRIA, Va., March 17 -- United States Patent no. 12,575,513, issued on March 17, was assigned to The Toro Co. (Bloomington, Minn.).
"Stump grinder with grinding arm and control" was invented by Joseph C. Knipp (Elko, Minn.), Christopher J. Kost (North Mankato, Minn.), David A. Murray (Eagan, Minn.), Landon M. Aldinger (Iowa Falls, Iowa) and John P. Azure (Bloomington, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A stump grinder has a grinding arm that durably mounts a rotatable grinding wheel. The stump grinder includes a motor with a drive shaft that is rotatably coupled to the grinding wheel. The grinding wheel includes a stub shaft attached thereto that is received within a bearing. A control...