Patents by Inventor Yisun Chang

Yisun Chang 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).

  • System and method for desulfating a NOx trap
    Patent number: 7325394
    Abstract: In an apparatus having an internal combustion engine and a catalytic device for treating NOx emissions from the internal combustion engine, a method of operating the engine comprising operating the engine for a first interval in such a manner as to store and reduce NOx emissions in the catalytic device thereby accumulating stored sulfur in the catalytic device, and operating the engine for a second interval in such a manner as to remove a portion of the stored sulfur from the catalytic device and to leave a substantial portion of stored sulfur in the catalytic device.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: February 5, 2008
    Assignee: Ford Global Technologies LLC
    Inventors: Paul Laing, Yisun Chang, Robert Hammerle
  • System and Method for Desulfating a NOx Trap
    Publication number: 20070251215
    Abstract: In an apparatus having an internal combustion engine and a catalytic device for treating NOx emissions from the internal combustion engine, a method of operating the engine comprising operating the engine for a first interval in such a manner as to store and reduce NOx emissions in the catalytic device thereby accumulating stored sulfur in the catalytic device, and operating the engine for a second interval in such a manner as to remove a portion of the stored sulfur from the catalytic device and to leave a substantial portion of stored sulfur in the catalytic device.
    Type: Application
    Filed: April 27, 2006
    Publication date: November 1, 2007
    Inventors: Paul Laing, Yisun Chang, Robert Hammerle