Patents by Inventor Scott Joseph Schraff

Scott Joseph Schraff 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 system for controlling the output of an engine driven welder
    Patent number: 5670070
    Abstract: A method and system of controlling the output current/voltage characteristic curve of an engine driven alternator welder with a maximum open circuit output voltage, including a rotary engine, a three phase alternator, a rectifier bridge having a number of electronic switching devices for directing current to the output at an operating point determined by the firing angle of the switching devices, a sensor for sensing output current, a sensor for sensing output voltage, and a microprocessor output control device for controlling the firing angles of said switching devices in response to the sensed current and sensed voltage.
    Type: Grant
    Filed: August 31, 1995
    Date of Patent: September 23, 1997
    Assignee: The Lincoln Electric Company
    Inventors: Keith Leon Clark, Denis Michael Osowski, Scott Joseph Schraff