Patents by Inventor Wolfgang Stengel

Wolfgang Stengel 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).

  • Process and device for non-destructive determination of the prestressing condition of ferromagnetic securing elements
    Patent number: 5280725
    Abstract: The process described enables in situ testing of securing elements, for example bolted assemblies, to verify that their tightness is adequate and to detect any material defects. To this end, it is sufficient that a coil (19) subjects at least one part of the screwed assembly to an alternating magnetic field. This field, whose frequency can be varied, provides a spectrum containing information about the tightness of the assembly.
    Type: Grant
    Filed: March 4, 1992
    Date of Patent: January 25, 1994
    Inventor: Wolfgang Stengel