ALEXANDRIA, Va., June 2 -- United States Patent no. 12,644,336, issued on June 2, was assigned to Tricam Industries LLC (Eden Prairie, Minn.).
"Step ladder" was invented by Jeff Skubic (Eden Prairie, Minn.), Dennis D. Simpson (Plymouth, Minn.), Ben Williams (Chaska, Minn.) and Yongxue Lu (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A ladder including a first frame, a second frame and a platform assembly. The first frame includes one or more fixed steps. The platform assembly includes a first platform pivotably coupled to the first frame, a second platform pivotably coupled to the first frame, a first linkage coupled between the second frame and one of the first platform and the second platform, a...