Patents by Inventor John M. Beresford

John M. Beresford 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).

  • Acoustic sensor
    Patent number: 5798488
    Abstract: An acoustic sensor for use as part of a drill string in a borehole has an acoustic transducer which vibrates the drill bit in contact with the rock at the end of the borehole to generate acoustic signals in the rock. These acoustic signals propogate through the rocks ahead of the drill bit and are reflected and scattered to return to an acoustic sensor contained within the drill string.
    Type: Grant
    Filed: November 11, 1996
    Date of Patent: August 25, 1998
    Assignee: GEC Marconi Limited
    Inventors: John M. Beresford, Paul A. Crowther