ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,064, issued on April 21.
"Single handrail telescopic ladder" was invented by Miaoren Chen (Jinhua, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A single handrail telescopic ladder is provided. Which includes front tubes and rear tubes that are hinged to each other at a top; a single handrail tube that is scalability inserted into one of the front tubes; the front tubes are provided with a fixing hole, and a locking hole corresponding to the fixing hole is provided at a corresponding position of the single handrail tube; locking members pass through the fixing hole and the locking hole when the single handrail tube is pulled out from the fro...