Issued Patents 1989
Showing 1–3 of 3 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 |
| 4830951 | Naphtholactamsquaric acid dyes and optical recording materials containing these dyes | Matthias Dust, Peter Neumann, Peter Hauser, Gerhard Wagenblast, Heidi Benthack-Thoms +2 more | 1989-05-16 |
| 4806664 | Novel tetraphenyldithiolene complexes, asymmetrically substituted benzoins, and optical recording materials containing the novel complexes | Wolfgang Schrott, Peter Neumann, Bernhard Albert, Michael Thomas, Helmut Barzynski +1 more | 1989-02-21 |