ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,881, issued on March 18, was assigned to CEMCO LLC (City of Industry, Calif.).
"Two-piece track system" was invented by Donald Anthony Pilz (Livermore, Calif.), Raymond Edward Poliquin (City of Industry, Calif.) and Fernando Hernandez Sesma (City of Industry, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A fire-rated receiver channel includes at least one intumescent or other fire-resistant material strip. The receiver channel can nest with a framing member, such as metal tracks, headers, header tracks, sill plates, bottom tracks, metal studs, wood studs or wall partitions, and placed at a perimeter of a wall assembly to create a fire block...