Patent ID: 9453676
Filing Date: 2016-09-27
CPC Classification: A61K,C08B,C08L,F26B

Claim Text:
1. A method of preparing a powder, comprising the steps of: a. spraying a carrier liquid into a chamber to form a flow of liquid droplets, wherein the carrier liquid contains a powder-forming ingredient; b. freezing the liquid droplets into frozen particles; c. entraining the flow of frozen particles within a net flow of gas of less than about 8 SCFM, the flow of gas entering the chamber around the flow of frozen particles to prevent the frozen particles from accumulating on the walls of the chamber; d. collecting the frozen particles on a filter; and e. drying the frozen particles by passing a flow of gas downward through the frozen particles at a rate of greater than about 16 SCFM to remove the carrier liquid; and f. forming a dry powder.