Patents by Inventor Friedrich W. Kaiser

Friedrich W. Kaiser 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).

  • Exhaust pipe of an internal-combustion engine
    Patent number: 5279117
    Abstract: An exhaust pipe of an internal-combustion engine in which self-regulating throttle element is arranged behind the catalyst. In the warm-up phase of the internal-combustion engine, the throttle element closes off the exhaust pipe almost completely. The resulting increased exhaust back pressure causes a higher mass flow rate of the engine, whereby the exhaust gas temperature rises and the catalyst is warmed up rapidly.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: January 18, 1994
    Assignee: Dr.Ing.h.c.F. Porsche AG
    Inventor: Friedrich W. Kaiser