Patent ID: 7469488

Claim:
A method of producing spray dried particles suitable for inhalation comprising: a) correlating a dew point value of a drying gas with the resulting tap density, median geometric diameter, and median aerodynamic diameter of the spray dried particles formed by contacting a sprayed liquid feed with the drying gas over a range of drying gas dew point values; b) selecting a dew point value of a drying gas from the range of dew point values of step (a) that corresponds to a targeted median geometric diameter, a targeted median aerodynamic diameter and a targeted tap density of spray-dried particles; c) generating a drying gas having said selected dew point; and d) contacting the sprayed liquid feed with the drying gas having said selected dew point thereby producing particles having the targeted median aerodynamic diameter, targeted tap density and targeted median geometric diameter, wherein said particles are suitable for inhalation.