Patent 7582284 was granted and assigned to Nektar (pulminary therapeutics business unit) on September, 2009 by the United States Patent and Trademark Office.
The present invention relates to active substances in particulate form, to methods for preparing them, to formulations containing them and to uses of such substances and formulations. A preferred embodiment is directed to particulate suspensions having improved flocculation behavior in a suspension vehicle, such as a hydrofluoroalkane propellant used in metered dose inhalers.