Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889987 | Photo ion spectrometer | Dieter M. Gruen, Michael J. Pellin | 1989-12-26 |
| 4864130 | Photo ion spectrometer | Dieter M. Gruen, Michael J. Pellin | 1989-09-05 |
| 4855596 | Photo ion spectrometer | Dieter M. Gruen, Michael J. Pellin | 1989-08-08 |