Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5352890 | Quadrupole ion trap mass spectrometer having two axial modulation excitation input frequencies and method of parent and neural loss scanning | Jodie V. Johnson, Randall E. Pedder, Richard A. Yost | 1994-10-04 |
| 5171991 | Quadrupole ion trap mass spectrometer having two axial modulation excitation input frequencies and method of parent and neutral loss scanning | Jodie V. Johnson, Randall E. Pedder, Richard A. Yost | 1992-12-15 |
| 5075547 | Quadrupole ion trap mass spectrometer having two pulsed axial excitation input frequencies and method of parent and neutral loss scanning and selected reaction monitoring | Jodie V. Johnson, Randall E. Pedder, Richard A. Yost | 1991-12-24 |
| 4816675 | Quadrupole mass filter with unbalanced R.F. voltage | William J. Fies | 1989-03-28 |
| 4536652 | Hybrid mass spectrometer | Graham Cooks, Gerhard Jung, Peter Dobberstein | 1985-08-20 |
| 4214160 | Mass spectrometer system and method for control of ion energy for different masses | William J. Fies, Ronald D. Smith, John R. Reeher | 1980-07-22 |