Patents by Inventor Harry Gellert

Harry Gellert 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 detecting a gas leak in a pem fuel cell
    Publication number: 20060035118
    Abstract: A method is for detecting a gas leak between the anode gas region and the cathode gas region of a PEM fuel cell. According to the method, a) the fuel cell is charged with a direct current, and b) the temporal course of the electrical voltage on the fuel cell is measured. Using only a small amount of equipment, a leak test can be carried out on a fuel cell stack. The test is highly sensitive even to extremely small leaks, but can also be used for large leaks, and indicates the exact position of defective fuel cells within the fuel cell.
    Type: Application
    Filed: April 24, 2003
    Publication date: February 16, 2006
    Inventors: Detley Coerlin, Harry Gellert, Walter Stuhler
  • Method for operating a fuel cell system and fuel cell system
    Patent number: 6203935
    Abstract: A fuel cell system having a fuel cell block is operated by compressing an operating agent for the fuel cell block with a liquid ring compressor. After compressing the operating agent, water is separated from the operating agent in an apparatus for water separation. The fuel cell block is cooled with the water and, after the cooling, at least a portion of the water is fed back into the apparatus for water separation. This measure reduces the number of components which form the fuel cell system.
    Type: Grant
    Filed: March 11, 1999
    Date of Patent: March 20, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Walter Stühler, Herbert Stenger, Harry Gellert