Patents by Inventor David L. Bigham

David L. Bigham 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).

  • Batch sludge dehydrator
    Patent number: 6061924
    Abstract: A dehydrating apparatus includes a chamber for receiving wet material to be dehydrated. A rotatably-mounted agitator is provided with the chamber. The agitator is adapted to agitate material in the chamber when the agitator rotates in a first direction and convey the material out of the chamber when the agitator rotates in the other, second direction.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: May 16, 2000
    Assignee: Rubicon Development Co. L.L.C.
    Inventors: Danny R. Bolton, David L. Bigham
  • Drying apparatus with rotatable housing
    Patent number: 5566469
    Abstract: A thermal vaporization apparatus includes a cylindrical tube having two ends. A base is provided, with the tube being rotatable with respect to the base. A first drive mechanism applies rotating force to the tube. An auger having two ends extends through the tube, and a second drive mechanism applies rotating force to the auger. At least one gas-fired burner to heat the exterior of the tube while in rotation is provided. A feed mechanism for introducing wet material into the interior of the tube and exterior of the auger within the tube is also provided.
    Type: Grant
    Filed: July 18, 1995
    Date of Patent: October 22, 1996
    Assignee: Fen-Tech Environmental, Inc.
    Inventors: Danny R. Bolton, David L. Bigham