ALEXANDRIA, Va., Dec. 9 -- United States Patent no. 12,490,688, issued on Dec. 9, was assigned to Black & Decker Inc. (New Britain, Conn.).
"Concentrator attachment for blower air tube" was invented by Nathan Greene (Baltimore) and Khoa Nguyen (Owings Mills, Md.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A concentrator nozzle attachment for a blower device is disclosed that increases the airflow velocity of the blower without sacrificing the field of the jetting air. The concentrator nozzle is formed of an outer ring with a centrally located guide surface and is placed at the exit of an air tube. As the air exits the air tube, it's forced to flow around the guide surface, thus increasing its velocity. Th...