Patents Assigned to Benterra Corporation
  • Bentonite nodules
    Patent number: 7030064
    Abstract: Compressed bentonite-containing nodules are disclosed as are methods for their production and methods for using them to plug wells.
    Type: Grant
    Filed: September 10, 2003
    Date of Patent: April 18, 2006
    Assignee: Benterra Corporation
    Inventors: Maurice L. James, Kieth A. Hejl