Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842896 | Production of magnetic recording media | Albert Kohl, Jenoe Kovacs, Werner Balz, Wulf Muenzer | 1989-06-27 |
| 4835909 | Surface treatment of disk-shaped nickel-plated aluminum substrates | Juergen Richter, Gerd Maurer, Friedrich Domas, Werner Loeser, Rainer Bender +2 more | 1989-06-06 |