Patents by Inventor Kieth A. Hejl

Kieth A. Hejl 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).

  • 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
  • Patent number: 6820692
    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 26, 2001
    Date of Patent: November 23, 2004
    Assignee: Chevron U.S.A. Inc.
    Inventors: Maurice L. James, Kieth A. Hejl
  • Publication number: 20040045711
    Abstract: Compressed bentonite-containing nodules are disclosed as are methods for their production and methods for using them to plug wells.
    Type: Application
    Filed: September 10, 2003
    Publication date: March 11, 2004
    Inventors: Maurice L. James, Kieth A. Hejl
  • Publication number: 20020096330
    Abstract: Compressed bentonite-containing nodules are disclosed as are methods for their production and methods for using them to plug wells.
    Type: Application
    Filed: September 26, 2001
    Publication date: July 25, 2002
    Inventors: Maurice L. James, Kieth A. Hejl