Patents by Inventor Josef Dühnen

Josef Dühnen 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).

  • System and method for in-process integrity test of a filter
    Patent number: 7770434
    Abstract: The invention relates to a method for in-process integrity test of a filter. The method may comprise the steps of: coupling a gas source to an input side of a filter without removing the filter from a dispenser system, the gas source supplying a gas and controlling a pressure of the gas; coupling a tube to an output side of the filter, the tube being filled with a liquid; increasing the pressure while monitoring the tube, with a light beam, for a displacement of the liquid by one or more gas bubbles; and determining a value of the pressure at which the displacement of the liquid is detected.
    Type: Grant
    Filed: April 27, 2006
    Date of Patent: August 10, 2010
    Assignee: General Electric Company
    Inventors: Michael Brüssermann, Josef Dühnen, Stefan Riese