ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,411, issued on May 20, was assigned to Hoffman & Hoffman Inc. (Greensboro, N.C.).

"System for accessing and/or allowing safe movement on a unit mounted on a structural support" was invented by Nathan Brian Sollenberger (Charlotte, N.C.) and Ryan Charles Kerfein (Huntersville, N.C.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Various embodiments and features of railing systems are provided. For example, the railing system may be disposed around industrial/commercial equipment (e.g., rooftop condensing unit) that includes a baserail near the bottom of the industrial/commercial equipment and may be disposed on a structural support. The railing system...