Patents by Inventor Russell Lloyd Dummer

Russell Lloyd Dummer 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).

  • LWD resistivity device with inner transmitters and outer receivers, and azimuthal sensitivity
    Patent number: 6377050
    Abstract: A borehole tool for logging resistivity of geologic formations, having at least two inner transmitters surrounded by at least two outer receivers. Each transmitter is sequentially excited, and measurements are taken at each of the receivers. The phase differences between these received signals are determined, once for each transmitter, and the two values are averaged to estimate the resistivity value of the surrounding formations. More than two receivers can be used. An azimuthal receiver array is also used to identify boundary transitions.
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: April 23, 2002
    Assignee: Computalog USA, Inc.
    Inventors: Roland Chemali, Russell Lloyd Dummer