ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,385,731, issued on Aug. 12.
"Stair tread measurer" was invented by Jiayi Lai (Qingyuan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a novel stair tread measurer, including connecting bases, a sliding groove, a sliding bar, a connecting block, and edge rulers. One end of one of the connecting bases is connected to the sliding bar and the other end thereof is movably connected to one of the edge rulers. One end of the other one of the connecting bases is connected to the connecting base and the other end thereof is movably connected to the other one of the edge rulers. The sliding bar is slidably connected to one side of the sliding ...