Patent 8230622 was granted and assigned to Prinoth (company) on July, 2012 by the United States Patent and Trademark Office.
A ski slope snow tiller having a frame connected to a tractor movable in a travelling direction; a shaft crosswise to the travelling direction and fitted with tools for working the snow cover; a casing surrounding the shaft; a mat towed over the surface of the snow cover, behind the casing; and a guard located at least over the casing and the mat, to prevent snow accumulating.