ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,539,479, issued on Feb. 3, was assigned to DelStar Technologies Inc. (Alpharetta, Ga.) and LMS Technologies Inc. (Bloomington, Minn.).

"Dual-layer gas filters and systems and methods for making the same" was invented by Andrew G. Platt (Middletown, Del.), Lenny Pompeo (Middletown, Del.) and Joel Trojnar (Smyrna, Pa.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Filter media and filters are provided that include at least two layers and a plurality of nanoparticles dispersed in depth within at least one of the layers. A gas filter comprises a first layer of fibers, a second layer of fibers bonded to the first layer and a plurality of nanoparticles incorpo...