Patents by Inventor Keith C. Challenger

Keith C. Challenger 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).

  • Brush wear indicator
    Patent number: 5870026
    Abstract: Indicators of incremental brush wear are disclosed. Versions of the indicators may comprise signal wire assemblies embedded in brushes so that they continuously contact rotating components of electrical machines. Each such wire assembly typically is chosen so that its nominal electrical resistance differs from that of its corresponding brush, while its mechanical properties remain similar to those of the brush.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: February 9, 1999
    Assignee: The Morgan Crucible Company plc
    Inventor: Keith C. Challenger