Patents by Inventor Karl-Heinz Duemmel

Karl-Heinz Duemmel 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).

  • Silencer, especially for portable motor chain saws
    Patent number: 4142607
    Abstract: Disclosed is an exhaust silencer suitable for use with portable combustion engines, and particularly for use with chain saw engines, comprising a chamber having an inlet and outlet for receiving the engine exhaust; means disposed about the chamber outlet for reducing the kinetic energy of the exhaust flowing therethrough; and an air duct means mounted exteriorly of the chamber below the chamber outlet for cooling the chamber, the kinetic energy reducing means, and the exhaust gas by contact with a stream of ambient air flowing therethrough.
    Type: Grant
    Filed: September 23, 1977
    Date of Patent: March 6, 1979
    Assignee: Firma Andreas Stihl
    Inventors: Goetz Landwehr, Helmut Lux, Karl-Heinz Duemmel