Patents by Inventor Fredrik RÖNNMARK

Fredrik RÖNNMARK 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).

  • Muffler comprising a Helmholtz resonator and a vehicle comprising such a muffler
    Patent number: 11255238
    Abstract: A muffler for a vehicle, where the muffler comprises a partition wall that divides the interior in a first chamber and a second chamber, where an inlet pipe comprising a perforated section arranged in the first chamber and a closed section arranged in the first chamber, where the outlet opening of the inlet pipe is arranged in the second chamber, a first outlet pipe comprising an inlet opening arranged in the first chamber and an outlet opening arranged outside of the muffler, where the muffler comprises a second outlet pipe having an inlet opening arranged in the second chamber, and where the second outlet pipe is provided with an exhaust valve adapted to open or close the exhaust gas flow through the second outlet pipe. The advantage of the invention is that a muffler with an improved low frequency noise attenuation and low backpressure is provided.
    Type: Grant
    Filed: March 25, 2019
    Date of Patent: February 22, 2022
    Assignee: Volvo Car Corporation
    Inventors: Fredrik Rönnmark, Mathias Klein
  • MUFFLER COMPRISING A HELMHOLTZ RESONATOR AND A VEHICLE COMPRISING SUCH A MUFFLER
    Publication number: 20190323396
    Abstract: A muffler for a vehicle, where the muffler comprises a partition wall that divides the interior in a first chamber and a second chamber, where an inlet pipe comprising a perforated section arranged in the first chamber and a closed section arranged in the first chamber, where the outlet opening of the inlet pipe is arranged in the second chamber, a first outlet pipe comprising an inlet opening arranged in the first chamber and an outlet opening arranged outside of the muffler, where the muffler comprises a second outlet pipe having an inlet opening arranged in the second chamber, and where the second outlet pipe is provided with an exhaust valve adapted to open or close the exhaust gas flow through the second outlet pipe. The advantage of the invention is that a muffler with an improved low frequency noise attenuation and low backpressure is provided.
    Type: Application
    Filed: March 25, 2019
    Publication date: October 24, 2019
    Inventors: Fredrik RÖNNMARK, Mathias KLEIN