Patents by Inventor Bernd Fuhrmann

Bernd Fuhrmann 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 with variable damping characteristics
    Patent number: 5821474
    Abstract: A muffler and an actuating cell provided so that the acoustic properties of the muffler can be changed. The pressure drop in the muffler is fed to the actuating cell as a control pressure. The actuating cell has a plurality of chambers which are separated by diaphragms. Each diaphragm is supported by a spring and each chamber has a pressure connection. A first pressure line feeds the total gas pressure to the overpressure side of the first diaphragm. Another pressure line directs the static gas pressure to the low-pressure side of this diaphragm. Attached to the diaphragm is a piston rod which carries a valve closing element which closes or opens a gas feed pipe.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: October 13, 1998
    Assignee: Heinrich Gillet Gmbh & Co. KG
    Inventors: Thomas Olszok, Frieder Kunz, Bernd Fuhrmann