Patents by Inventor Michael P. Christopherson

Michael P. Christopherson 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).

  • Motorcycle dynamic exhaust system
    Patent number: 7347045
    Abstract: The present invention provides a method of operating a dynamic exhaust system of a motorcycle engine. The method includes providing a valve in the exhaust system that is movable to direct exhaust gases between a first flow path through the exhaust system and a second flow path through the exhaust system. The method includes actuating the valve at a first speed to redirect exhaust gases from the first flow path to the second flow path and actuating the valve at a second speed greater than the first speed to redirect exhaust gases from the second flow path to the first flow path.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: March 25, 2008
    Assignee: Harley-Davidson Motor Company Group, Inc.
    Inventors: Alexander J. Bozmoski, Timothy R. Osterberg, Michael P. Christopherson, Anthony L. Coffey, William P. Pari, Michael R. Richter, Stacy L. Smith, Richard G. Pierson, Michael A. Selwa