Patents by Inventor Kristjan Gunnarsson

Kristjan Gunnarsson 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 and method of using same for determining the position of a tool relative to a workpiece
    Patent number: 4554834
    Abstract: An acoustic sensor and method of using same for determining the position of a tool from a workpiece are disclosed in which a piezoelectric transducer having a curved surface emits a sound wave which strikes the workpiece and is reflected back to the sensor. The sensor and tool are positioned relative to one another so that the workpiece will be near the focal point of the curved surface when the tool is operating. This positioning substantially overcomes the attenuation problems of high frequency sound waves transmitted through air.
    Type: Grant
    Filed: October 28, 1983
    Date of Patent: November 26, 1985
    Assignee: Carnegie-Mellon University
    Inventors: Friedrich B. Prinz, James F. Hoburg, Kristjan Gunnarsson