Patents by Inventor Frederick C. Schwerer, III

Frederick C. Schwerer, III 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).

  • Magnetic testing method and apparatus having provision for eliminating inaccuracies caused by gaps between probe and test piece
    Patent number: 4215310
    Abstract: A method and apparatus for electromagnetic testing of magnetic and/or electrically conductive materials. The apparatus includes the usual test probe which carries excitation and pickup coils and is placed against a test piece of magnetic and/or electrically conductive material. The invention eliminates inaccuracies in the test caused by variable distances or gaps between the probe and test piece surface. Properties of the test pieces are determined by applying a controlled alternating drive current to the excitation coil so as to produce a predetermined a-c voltage in the pickup coil and measuring the drive current applied to the excitation coil when the time-integral of the voltage induced in the a-c pickup coil corresponds to zero magnetic flux in the gaps.
    Type: Grant
    Filed: July 10, 1978
    Date of Patent: July 29, 1980
    Assignee: United States Steel Corporation
    Inventor: Frederick C. Schwerer, III