ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,723,769, issued on Sept. 1.
"Personal desktop air curtain" was invented by Nathan Carrol Riddle (Burton, Mich.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An air curtain, thin and uniform in velocity across its width, is produced by a low cost, miniaturized, modular device for use at a desktop as a personal protection from airborne contaminants. A rear facing, thin centrifugal blower discharges air tangentially, which is redirected to form several air zones. Flow is made uniform in velocity across each zone width and zones recombine and reflected in a reversed flow path to the front to form an air curtain. Advancements are in flow smoothing by a corr...