Patents by Inventor David Balfour Smith

David Balfour Smith 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).

  • Transmission of data in boreholes
    Patent number: 6912177
    Abstract: Data is transmitted along a borehole containing a drill stem (2) by means of a transmitter (6) which converts electric data signals to acoustic signals propagating along the drill stem (2). The acoustic signals are converted back to electric form by a receiver (12) which also processes the signals. In the preferred form the signals are stored in a receiver memory (15) for subsequent retrieval using a pick-up tool (5) lowered into the borehole. The system is particularly useful in moving data past an obstruction such as a shut-in valve (4).
    Type: Grant
    Filed: November 25, 1997
    Date of Patent: June 28, 2005
    Assignee: Metrol Technology Limited
    Inventor: David Balfour Smith