ALEXANDRIA, Va., March 3 -- United States Patent no. 12,564,759, issued on March 3, was assigned to OHFG TECHNOLOGIES(SHANGHAI) Co. LTD. (Shanghai).
"Stair stepper" was invented by Ping Liu (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided in the invention is a stair stepper. A rotating mechanism includes a first rotating shaft and a second rotating shaft that are fixed in an intersecting manner, and the rotating mechanism is rotatably connected to a base through the first rotating shaft; a pedal mechanism and a linkage member are sequentially connected to the second rotating shaft, a limiting rod is provided on the linkage member, and a transverse rod of the limiting rod is slidably connecte...