ALEXANDRIA, Va., May 19 -- United States Patent no. 12,629,621, issued on May 19, was assigned to Purafil Inc. (Doraville, Ga.).

"Antimicrobial filter media" was invented by Donald Cho (Carrollton, Texas), William G. England (Suwanee, Ga.), Anthony John Lawson (Verona, Italy), Gerrit Wijbenja (Leeuwarden, Netherlands) and Mei Xin (Suwanee, Ga.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A product and method of manufacturing and producing antimicrobial fibers using an antimicrobial additive material. The method comprising using various antimicrobial metals incorporated and embedded into an inorganic material as metal ions within the additive material that can be formulated into a masterbatch precursor mate...