Patents by Inventor Randall E. Pedder

Randall E. Pedder 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).

  • Quadrupole ion trap mass spectrometer having two axial modulation excitation input frequencies and method of parent and neural loss scanning
    Patent number: 5352890
    Abstract: There is described a method of operating an ion trap mass spectrometer. The method is carried out by trapping ions of selected masses in a three-dimensional field and then generating at least two fields in said trap having different frequencies to excite multiple trapped ions.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: October 4, 1994
    Assignees: University of Florida, Finnigan Corporation
    Inventors: Jodie V. Johnson, Randall E. Pedder, Richard A. Yost, Michael S. Story
  • Quadrupole ion trap mass spectrometer having two axial modulation excitation input frequencies and method of parent and neutral loss scanning
    Patent number: 5171991
    Abstract: Disclosed is quadrupole ion trap mass spectrometer of the type including a ring electrode and end caps defining a trap volume and including means for introducing sample ion into the ion trap and means for applying voltages to the electrodes. Further included are means for applying two resonant excitation waveforms at two different frequencies and two different voltages between the end cap electrodes to simultaneously excite multiple ions in the ion trap volume.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: December 15, 1992
    Assignee: Finnigan Corporation
    Inventors: Jodie V. Johnson, Randall E. Pedder, Richard A. Yost, Michael S. Story
  • Quadrupole ion trap mass spectrometer having two pulsed axial excitation input frequencies and method of parent and neutral loss scanning and selected reaction monitoring
    Patent number: 5075547
    Abstract: This invention relates generally to a quadrupole ion trap mass spectrometer and method of operation and more particularly to an ion trap mass spectrometer in which pulses of energy of predetermined frequencies are applied across the end caps to independently and sequentially excite ions of different masses trapped in the ion trap to perform parent scanning, neutral loss scanning and selected reaction monitoring.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: December 24, 1991
    Assignees: Finnigan Corporation, University of Florida
    Inventors: Jodie V. Johnson, Randall E. Pedder, Richard A. Yost, Michael S. Story