Patent 7543761 was granted and assigned to Ecolab Inc on June, 2009 by the United States Patent and Trademark Office.
A method and apparatus dispenses first and second fragrances by utilizing a fog nozzle in a ductwork of a facility. The first fragrance is dispensed, at intervals, through the fog nozzle into the ductwork and the second fragrance is dispensed after the first fragrance is dispensed, wherein fragrance desensitivity is reduced.