Patents by Inventor David Nixon Smith

David Nixon Smith has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Wood gasification apparatus
    Patent number: 7144558
    Abstract: A wood gasification apparatus in which cellulosic material is transported by an auger through a housing and heated to vaporize at least a portion of the cellulosic material by frictional heating. The auger and housing define a spiral void through which the cellulosic material is propelled from the inlet to the outlet, and which continually decreases in volume from the inlet to the outlet. The ever decreasing volume of the void increases the pressure on the cellulosic material and maximizes the frictional heating until the material reaches a vaporization temperature.
    Type: Grant
    Filed: July 1, 2004
    Date of Patent: December 5, 2006
    Assignee: Biogas Technologies, Inc.
    Inventors: David Nixon Smith, Allen Rice Ferrell