ALEXANDRIA, Va., April 21 -- United States Patent no. 12,606,228, issued on April 21.
"Self-propelled stair climber" was invented by Claudio Zonzini (Casaleone, Italy), Jacopo Zonzini (Casaleone, Italy), Arianna Zonzini (Cerea, Italy) and Laura Zonzini (Cerea, Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "A self-propelled goods stair climber includes: first and second motorized tracks and an elongated configuration parallel to a straight forward travel direction; a loading surface implemented to tilt with respect to the tracks around a first transverse axis perpendicular to the tracks; an actuated stabilization member movable between an extracted position so that the weight of the stair climber is car...