Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE38138 | Method for linearization of ion currents in a quadrupole mass analyzer | Robert E. Ellefson | 2003-06-10 |
| 5889281 | Method for linearization of ion currents in a quadrupole mass analyzer | Robert E. Ellefson | 1999-03-30 |
| 5852270 | Method of manufacturing a miniature quadrupole using electrode-discharge machining | — | 1998-12-22 |
| 5850084 | Ion lens assembly for gas analysis system | — | 1998-12-15 |
| 5834770 | Ion collecting electrode for total pressure collector | Louis C. Frees | 1998-11-10 |
| 5808308 | Dual ion source | — | 1998-09-15 |
| 4672203 | Two stage valve for use in pressure converter | — | 1987-06-09 |