ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,232,622, issued on Feb. 25, was assigned to JIANGSU ZHOU JIJIE INTELLIGENT TECHNOLOGY Co. LTD. (Suqian, China).
"Folding step stool" was invented by Xuelin Zhu (Suqian, China), Baisong Yao (Suqian, China) and Weiqiang Liu (Suqian, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A folding step stool includes a stool surface and a support structure for supporting the stool surface. The support structure is a foldable structure and comprises at least three support shafts. The stool surface is hinged to a rear side of a connecting line of tops of two adjacent support shafts. After being folded, the support structure is located on one side of a plane fo...