Patents by Inventor David Martin Nguyen

David Martin Nguyen 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).

  • Wear indicator for rotary drilling tools
    Patent number: 6167833
    Abstract: A wear indicator is provided for a rotary drilling tool of the type which comprises a bit body having a leading surface for cutting, abrading or reaming a hole in a target substrate material such as a sub-surface formation, the wear indicator comprising or including one or more discrete areas of a visually distinct material to that from which the drilling tool is mainly composed, the visually distinct material being arranged or configured at or adjacent the surface of the bit such that progressive wear of the bit and hence the or each visually distinct discrete area provides a visual indication of surface wear of the tool.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: January 2, 2001
    Assignee: Camco International Inc.
    Inventors: Douglas Bruce Caraway, Tony Martin Watts, Douglas Alan Patton, David Martin Nguyen