ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,709, issued on Sept. 16, was assigned to Otis Elevator Co. (Farmington, Conn.).
"Automatic transport device" was invented by Qiping Huang (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "An automatic transport device includes a first side and a second side opposite to each other, the first side includes a main drive device, a step drive wheel and a first handrail drive wheel in transmission connection with the main drive device, and the second side is provided with: a step driven wheel; a second handrail drive wheel, the handrail of the automatic transport device wraps around the first handrail drive wheel and the second handrail dri...