Patents by Inventor Harald Friedrich

Harald Friedrich 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).

  • Carbon brush and process for impregnating same
    Patent number: 6068926
    Abstract: The invention relates to a carbon brush, which is impregnated with a modified siloxane.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: May 30, 2000
    Assignee: Schunk Kohlenstofftechnik GmbH
    Inventors: Rainer Sperling, Harald Friedrich, Gunter Schardt
  • Carbon brush and process for impregnating same
    Patent number: 5798178
    Abstract: The invention relates to a carbon brush which is impregnated with a synthetic ester oil.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: August 25, 1998
    Assignee: Schunk Kohlenstofftechnik GmbH
    Inventors: Rainer Sperling, Harald Friedrich, Gunter Schardt