Patents by Inventor Clifford Schenkel

Clifford Schenkel 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).

  • Electrical resistance tomography from measurements inside a steel cased borehole
    Patent number: 6088655
    Abstract: Electrical resistance tomography (ERT) produced from measurements taken inside a steel cased borehole. A tomographic inversion of electrical resistance measurements made within a steel casing was then made for the purpose of imaging the electrical resistivity distribution in the formation remotely from the borehole. The ERT method involves combining electrical resistance measurements made inside a steel casing of a borehole to determine the electrical resistivity in the formation adjacent to the borehole; and the inversion of electrical resistance measurements made from a borehole not cased with an electrically conducting casing to determine the electrical resistivity distribution remotely from a borehole. It has been demonstrated that by using these combined techniques, highly accurate current injection and voltage measurements, made at appropriate points within the casing, can be tomographically inverted to yield useful information outside the borehole casing.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: July 11, 2000
    Assignee: The Regents of the University of California
    Inventors: William D. Daily, Clifford Schenkel, Abelardo L. Ramirez