Patents by Inventor Hansjorg J. Cueni

Hansjorg J. Cueni 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).

  • Patent number: 6576897
    Abstract: An ion collision cell for use in a mass spectrometer uses pre-collision and post-collision evacuation regions with a sealed collision region therebetween without the need for lens to separate the regions. A continuous rod design reduces mechanical cost and simplifies the electronic design. A longer collision cell allows lower pressure operation, and a curved configuration permits the exit of neutral particles. A square quadrapole cross-section allows a field free region in the center of the cell and minimizes ion node effects. In one embodiment, the ion collision cell includes first and second pole segments mounted on a first support plate with the pole segments having pole surfaces arranged at approximately 90° with respect to each other, and third and fourth pole segments mounted on a second support plate, the pole segments having pole surfaces arranged at approximately 90° with respect to each other.
    Type: Grant
    Filed: September 13, 2000
    Date of Patent: June 10, 2003
    Assignee: Varian, Inc.
    Inventors: Urs Steiner, Hansjorg J. Cueni