Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4414287 | Magnetic recording medium and its manufacture | Roland Koenig, Eberhard Koester, Werner Grau, Dieter Mayer | 1983-11-08 |
| 4287225 | Process of making a magnetic recording medium | Roland Koenig, Eberhard Koester, Werner Grau, Dieter Mayer | 1981-09-01 |