Patents by Inventor Donald A. Everhart

Donald A. Everhart 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 and apparatus for electronic control of the output of an engine driven, chopped DC welding power supply, driven by an AC generator
    Patent number: 5814788
    Abstract: An engine driven welding power supply is disclosed. The power supply produces a welding output having a plurality of volt-ampere curves. Each of the curves is associated with a selected current output and includes a slope over usable welding range. The magnitude of the slope over the usable welding range is dependent on the selected current output, particularly at a middle range of output currents. The power supply includes a AC generator that provides an AC signal. A rectifier rectifies the AC signals and provides a DC output. The DC output is provided to an output inductor that provides a smooth DC output. The V-A curves are produced by phase control in the rectifier.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: September 29, 1998
    Assignee: Illinois Tool Works Inc.
    Inventors: Donald A. Everhart, Neal E. Roebke