Patents by Inventor David C. Wiggert

David C. Wiggert 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).

  • Method for placement of a permeable remediation zone in situ
    Patent number: 5730550
    Abstract: A method for placement of remediation zones for treatment of contaminated groundwater in situ (10, 10A, 50, 60, 70, 80, 124) is described. The zones can be infiltrated or can be excavated and filled with a treatment composition to provide the remediation. A frozen wall (11) is temporarily established by freeze pipes (16, 18, 16A, 18A, 51, 52, 61, 62, 72, 73, 74, 75, 84, 85) regions (120,122) around the zone for the injection or excavation and filtration and then the frozen wall created is removed by thawing. The contaminated groundwater flows through the zone, preferably using a permanent barrier or wall (86) acting as a funnel. The method provides reliable and economic remediation in situ.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: March 24, 1998
    Assignee: Board of Trustees operating Michigan State University
    Inventors: Orlando B. Andersland, Craig S. Criddle, Roger B. Wallace, David C. Wiggert