Patents by Inventor John B Walter

John B Walter 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).

  • Apparatus and method for measuring the thickness of a coating
    Patent number: 6363787
    Abstract: An apparatus and method for measuring the thickness of a coating adhered to a substrate. An electromagnetic acoustic transducer is used to induce surface waves into the coating. The surface waves have a selected frequency and a fixed wavelength. Interpolation is used to determine the frequency of surface waves that propagate through the coating with the least attenuation. The phase velocity of the surface waves having this frequency is then calculated. The phase velocity is compared to known phase velocity/thickness tables to determine the thickness of the coating.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: April 2, 2002
    Assignee: Bechtel BWXT Idaho LLC
    Inventors: Nancy M. Carlson, John A. Johnson, David M. Tow, John B Walter