Patents by Inventor Stephen J. Trautwein

Stephen J. Trautwein 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).

  • Methods and apparatus for measuring double-interface shear in geosynthetics and geomaterials
    Patent number: 5739436
    Abstract: The present invention generally provides a double-interface shear device for measurement of interface strength between geosynthetics and geomaterials. The device provides for the convenient application of normal loads, for the measurement of interface strength prior to and following deformation along the interface, and for the measurement of volume changes of the specimen normal to the interface. In addition, the invention provides methods of measuring shear strength of the interface between geoengineering materials.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: April 14, 1998
    Inventor: Stephen J. Trautwein