Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871631 | Adhesively securable multilayer relief plate for flexographic printing | Hartwig Pieper, REINER MICHELS | 1989-10-03 |
| 4828641 | Joining the cut edges of photopolymerized flexographic printing plates | Hartwig Pieper, Willi Schabinger, Klaus Kessler | 1989-05-09 |