Patents by Inventor Dave Duff

Dave Duff 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).

  • Angle slope level indicator and uses thereof
    Publication number: 20070175080
    Abstract: The present invention relates to instruments for achieving improved accuracy in targeting objects from a distance. In particular, the present invention provides instruments designed to measure the slope of a reference point to an object at a distance. In addition, the present invention provides instruments designed to measure the cant level of a reference point to an object at a distance.
    Type: Application
    Filed: January 30, 2007
    Publication date: August 2, 2007
    Inventors: Dennis J. Sammut, Dave Duff, Ron Cox