ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,548,685, issued on Feb. 10, was assigned to VRD LLC (Reston, Va.).

"Method and apparatus for improved removal and retention of radioactive particulates from fluids" was invented by Robert Varrin (Reston, Va.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus for improved separation and containment of radioactive particulates from liquids by filtration. The improvements are achieved by utilizing more than one stage of filtration to remove radioactive particulates from a fluid. The first stage of filtration is designed for high liquid flowrate, low differential pressure across the filter medium, and reversibility of flow through the med...