Patents by Inventor Roger Holle

Roger Holle 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).

  • Air filter for an internal combustion engine
    Patent number: 6824591
    Abstract: An air filter for an internal combustion engine includes an air filter housing, the walls of which encompass a filter compartment in which a filter element is positioned, having an intake and an exhaust. Openings that can be sealed off or opened up based upon the operating conditions of the internal combustion engine are provided in a least one wall of the air filter housing. In this way, effective modulation of induction noise (sound modulation) can be achieved in a simple way and manner.
    Type: Grant
    Filed: February 10, 2003
    Date of Patent: November 30, 2004
    Assignee: Dr. Ing. h.c.F. Porsche Aktiengesellschaft
    Inventors: Roger Holle, Michael Wessels, Bernd Mueller
  • Air filter for an internal combustion engine
    Publication number: 20030172812
    Abstract: An air filter for an internal combustion engine includes an air filter housing, the walls of which encompass a filter compartment in which a filter element is positioned, having an intake and an exhaust. Openings that can be sealed off or opened up based upon the operating conditions of the internal combustion engine are provided in a least one wall of the air filter housing. In this way, effective modulation of induction noise (sound modulation) can be achieved in a simple way and manner.
    Type: Application
    Filed: February 10, 2003
    Publication date: September 18, 2003
    Inventors: Roger Holle, Michael Wessels, Bernd Mueller