Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Helmut Barzynski +2 more | 1989-10-24 |