Patents by Inventor Walter St{umlaut over (u)}hler

Walter St{umlaut over (u)}hler 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 operating a PEM fuel cell plant and PEM fuel cell plant
    Patent number: 6180271
    Abstract: A method is provided for operating a PEM fuel cell plant containing at least one PEM fuel cell block and a speed-controlled compressor upstream of the PEM fuel cell block for supplying air at a volume flow rate. The speed of the compressor is controlled to a desired value for adjusting the electric current of the PEM fuel cell block to a given value. The desired value is derived from the given value of the electric current. This measure ensures a simple control of the air volume flow rate for the PEM fuel cell block with low apparatus requirements. A PEM fuel cell plant is also provided.
    Type: Grant
    Filed: July 16, 1999
    Date of Patent: January 30, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Walter St{umlaut over (u)}hler, Herbert Stenger, Martin Keim