Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4840709 | Single-stage electrochemical image-forming process for reproduction layers | — | 1989-06-20 |
| 4840713 | Process for the electrochemical roughening of aluminum for use in printing plate supports | — | 1989-06-20 |
| 4834844 | Process for the selective additive correction of voids in copying layers | Werner Frass | 1989-05-30 |
| 4824535 | Process for the electrochemical graining of aluminum for use in printing plate supports | Dieter Mohr | 1989-04-25 |