Patents by Inventor Christopher J. Durrand

Christopher J. Durrand 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).

  • Drill bit assembly with a logging device
    Patent number: 7398837
    Abstract: In some aspects of the present invention, a drill bit assembly has a body portion intermediate a shank portion and a working portion. The working portion has at least one cutting element. In some embodiments, the drill bit assembly has a shaft with an end substantially coaxial to a central axis of the assembly. The end of the shaft substantially protrudes from the working portion, and at least one downhole logging device is disposed within or in communication with the shaft.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: July 15, 2008
    Inventors: David R. Hall, Francis Leany, Christopher J. Durrand, Paula Turner