ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,953, issued on Feb. 24, was assigned to PERI SE (Weissenhorn, Germany).
"Scaffold stairway having step holders" was invented by Julian Hellenschmidt (Ulm, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A scaffold stairway having two spaced-apart side rails designed as hollow profiles and a plurality of separate steps. The steps can be fastened by their free ends in holding devices for holding the steps that are designed as grooves on the mutually facing lateral faces of the side rails. The free ends of the steps lie on a groove flank or a groove flank portion. As a result, the side rails can be coupled."
The patent was filed on March 7, 201...