Patents by Inventor Karl Feser

Karl Feser 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).

  • Ion detector with bipolar accelerating electrode
    Patent number: 4267448
    Abstract: The ion detector of a mass spectrometer includes an accelerating electrode 10, 34, 38 disposed between the spectrometer discharge shutter 6 and a secondary electron multiplier 18. The electrode 10 is selectively energized by a high positive or negative voltage opposite the initial polarity of the ions by a source 16. Thus, a positively energized electrode draws in and accelerates negative ions, and strips away their electrons to leave them positively charged for further acceleration into the first dynode of the secondary electron multiplier.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: May 12, 1981
    Assignee: Varian Mat GmbH
    Inventors: Karl Feser, Curt Brunnee