Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889756 | Sheet-like, multilayer, laser-optical recording material | Heidi Benthack-Thomas, Karl Hellwig, Christof Taubitz | 1989-12-26 |
| 4876356 | Naphtholactam dyes and optical recording medium containing these days | Matthias Dust, Peter Neumann, Ernst Schefczik, Heidi Benthack-Thoms, Klaus D. Schomann +2 more | 1989-10-24 |
| 4830465 | Irreversible optical recording media and fabrication thereof | Arend Werner, Hartmut Hibst | 1989-05-16 |
| 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, Klaus D. Schomann +1 more | 1989-02-21 |