ALEXANDRIA, Va., July 16 -- United States Patent no. 12,669,015, issued on June 30, was assigned to Ladder Solutions USA Inc. (Leumeah, Australia).

"Ladder" was invented by Paul Walkerden (Leumeah, Australia) and Kenneth P. Walkerden (Leumeah, Australia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ladder that includes two side rails, with each side rail having a cross-sectional shape defining an at least partially enclosed channel including an outer wall. The first and second lateral walls extend inward from the outer wall, and the first lateral wall includes a first offset defining a first inner wall. Each of the lateral walls extends further inward beyond the first inner wall to define first and second...