Patents by Inventor Martin J. Simpson

Martin J. Simpson 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).

  • Clay liner for steep slopes
    Patent number: 5654064
    Abstract: A flexible clay liner in roll form for use on steep slopes. The liner includes a layer of geotextiles. The geotextiles are stitched together in rows of stitches which extend along the length of the liner. The thread used to make the stitching is a multifilament thread treated with a resin to prevent wicking through the liner. The spacing of the rows of stitches and the frequency of stitches along the rows are sufficient to transfer shear stresses through the bentonite layers, thus preventing the bentonite from becoming a shear plane.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: August 5, 1997
    Assignee: Claymax Corporation
    Inventors: William J. Simpson, Martin J. Simpson
  • Clay liner for steep slopes
    Patent number: 5564864
    Abstract: A flexible clay liner in roll form for use on steep slopes. The liner includes a layer of geotextiles. The geotextiles are stitched together in rows of stitches which extend along the length of the liner. The thread used to make the stitching is a multifilament thread treated with a resin to prevent wicking through the liner. The spacing of the rows of stitches and the frequency of stitches along the rows are sufficient to transfer shear stresses through the bentonite layers, thus preventing the bentonite from becoming a shear plane.
    Type: Grant
    Filed: March 7, 1994
    Date of Patent: October 15, 1996
    Assignee: Claymax Corporation
    Inventors: William J. Simpson, Martin J. Simpson