Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5180382 | Bone screw | Robert Frigg, Stephan M. Perren, Paul Gisin | 1993-01-19 |
| RE31628 | Osteosynthetic pressure plate construction | Stefan Perren, Max E. Russenberger | 1984-07-10 |