Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5631470 | Liquid ion chamber electrode apparatus | Derek J. Day, Reza Majidi-Ahy, Willi Fencl, Salvatore Provencale, Rolf Staehelin | 1997-05-20 |
| 5594252 | Three terminal ion chambers | Derek J. Day, Rolf Stahelin, Salvatore Provenzale, Willi Fencl | 1997-01-14 |