Patents by Inventor Wiebe F. Pronker

Wiebe F. Pronker 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).

  • Method of and an apparatus for frequency selective ultrasonic inspection of multi-layered structures
    Patent number: 5303590
    Abstract: A method of an apparatus for ultrasonic inspection of multi-layered structures having acoustic transmission (I, III, V and VII) and reflection (II, IV, VI and VIII) frequency bands. Variations in one or more parameters of specific layers are largely restricted to specific frequency bands of said layers. By analyzing transmitted or reflected signals with respect to the frequency bands of the structure, interpretation of signals due to parameter variations as caused by voids, inclusions or delaminations can be effectively eliminated. The method is preferably used for the inspection of laminated structures consisting of metal layers bonded by fibre reinforced resin layers.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: April 19, 1994
    Assignee: Fokker Aircraft, B.V.
    Inventors: Theodorus M. Modderman, Wiebe F. Pronker