Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5597854 | Latent light stabilizers | Jean-Luc Birbaum, Gerhard Rytz, Andreas Valet, Norbert W urms | 1997-01-28 |
| 5538840 | Photographic recording material containing a UV absorber | David G. Leppard, Gerhard Rytz, Norbert Wurms, Pascal Hayoz | 1996-07-23 |