ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,331, issued on April 29, was assigned to SUMITOMO HEAVY INDUSTRIES CONSTRUCTION CRANES Co. LTD. (Tokyo).
"Crane" was invented by Shingo Tanimoto (Aichi, Japan) and Jacinda Ng (Aichi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A crane includes a lower traveling body, an upper turning body that is turnably provided on the lower traveling body, a counterweight that is mounted on the upper turning body, and a ladder for getting on and off the upper turning body. The ladder has an engagement member that is able to be engaged with and disengaged from an engaged portion provided at the upper turning body, a support portion that supports the engage...