Patents by Inventor Clifford J. Schenkel

Clifford J. 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).

  • Subsurface resistivity modeling with electromagnetic fields using a conductive casing
    Patent number: 10114141
    Abstract: A method for efficiently calculating a subsurface distribution of electrical resistivity or conductivity generated by an electromagnetic (EM) source is provided wherein a significant fraction of the electric current produced by a source flows along a casing of a borehole. The method is comprised of two steps: calculating EM fields produced by the casing in the background lithology; and calculating EM fields caused by a resistivity anomaly in the presence of an EM field produced by the casing within a subsurface or survey model that does not include the casing.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: October 30, 2018
    Assignee: GroundMetrics, Inc.
    Inventors: H. Frank Morrison, Clifford J. Schenkel, Andrew D. Hibbs
  • Electromagnetic Fields Using a Conductive Casing
    Publication number: 20170068015
    Abstract: A method for efficiently calculating a subsurface distribution of electrical resistivity or conductivity generated by an electromagnetic (EM) source is provided wherein a significant fraction of the electric current produced by a source flows along a casing of a borehole. The method is comprised of two steps: calculating EM fields produced by the casing in the background lithology; and calculating EM fields caused by a resistivity anomaly in the presence of an EM field produced by the casing within a subsurface or survey model that does not include the casing.
    Type: Application
    Filed: February 20, 2015
    Publication date: March 9, 2017
    Inventors: H. Frank Morrison, Clifford J. Schenkel, Andrew D. Hibbs