Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822327 | Jacket for a flexible magnetic disk and production of the jacket | Bernhard Lenz, Kurt Zwintzscher, Dietrich Gruehn, Norbert Holl | 1989-04-18 |
| 4796137 | Protective jacket for a disk-shaped recording medium | Dietrich Gruehn, Joachim Hack, Peter Rudolf, Norbert Holl | 1989-01-03 |