ALEXANDRIA, Va., June 25 -- United States Patent no. 12,338,616, issued on June 24, was assigned to WASKEY BRIDGES INC. (Baton Rouge, La.).

"Cryogenic trench/trough apparatus and method" was invented by Stephen G. Benton Jr. (Metairie, La.), Benjamin Owens (Baton Rouge, La.), Charlie Belsom (Covington, La.), Kevin Babin (Baton Rouge, La.) and Jon Gary (Baton Rouge, La.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of installing a trench for containing a cryogenic spill, including the step of constructing multiple precast concrete sections at a first location, each section preferably having a bottom wall and spaced apart side walls connected to and extending up from the bottom wall. Each section pre...