Patent 7464733 was granted and assigned to 3D Systems on December, 2008 by the United States Patent and Trademark Office.
A method and apparatus for pneumatic powder transfer from a powder supply container to applications such as laser sintering systems. The method and apparatus use both constant and cyclic flows of a pressurized gas to fluidize and convey powders without the need for any tilting unloading stands, vibration or other mechanical working of the powder.