Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868091 | Photopolymerizable recording material, in particular for the production of printing plates and relief plates | Andreas Boettcher, Gerhard Hoffmann | 1989-09-19 |
| 4816379 | Production of relief plates and printing plates by a positive-working method | Gerhard Hoffmann, John Lynch | 1989-03-28 |