Patents by Inventor Mark J. Bergander

Mark J. Bergander 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 flux leakage probe with radially offset coils for use in nondestructive testing of pipes and tubes
    Patent number: 4789827
    Abstract: A magnetic flux detection probe for use in nondestructive testing of tubular products includes first and second flux leakage sensing coils mounted within a probe housing and radially offset with respect to each other to provide improved detection of defect locations and magnitudes. In a preferred embodiment a Hall effect sensing device is provided in the probe to sense variations in wall thickness of a tubular product while the flux leakage coils identify sharp responses of cracks and pits in the wall structure.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: December 6, 1988
    Assignee: Electric Power Research Institute
    Inventor: Mark J. Bergander