Patents by Inventor Rolf Heilmann

Rolf Heilmann 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).

  • Method for production of a multi-layer carbon brush
    Patent number: 7308759
    Abstract: A method for production of a multi-layer carbon brush including at least two electrically-conducting functional layers made from carbon material and at least one insulation layer made from an electrically-insulating material, running between consecutive functional layers. According to the invention, the corresponding multi-layer carbon brushes and the layers with desired thickness can be produced by applying the carbon material and the electrically-insulating material in a mold in a sequence corresponding to the layer sequence of the multi-layer carbon brush for production in powder form, then pressed and finally heat-treated.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: December 18, 2007
    Assignee: Schunk Kohlenstofftechnik GmbH
    Inventors: Rainer Sperling, Martin Schwarzer, Rolf Heilmann, Bernd Rinn
  • Method for production of a multi-layer carbon brush
    Publication number: 20050223538
    Abstract: A method for production of a multi-layer carbon brush including at least two electrically-conducting functional layers made from carbon material and at least one insulation layer made from an electrically-insulating material, running between consecutive functional layers. According to the invention, the corresponding multi-layer carbon brushes and the layers with desired thickness can be produced by applying the carbon material and the electrically-insulating material in a mold in a sequence corresponding to the layer sequence of the multi-layer carbon brush for production in powder form, then pressed and finally heat-treated.
    Type: Application
    Filed: March 3, 2003
    Publication date: October 13, 2005
    Inventors: Rainer Sperling, Martin Schwarzer, Rolf Heilmann, Bernd Rinn