Issued Patents All Time
Showing 1–6 of 6 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 |
| 4755901 | Protective jacket for a disk-shaped recording medium | Werner Fehrenbach, Dietrich Gruehn, Kurt Zwintzscher | 1988-07-05 |
| 4688129 | Protective jacket for a disk-shaped recording medium | Dietrich Gruehn, Norbert Holl | 1987-08-18 |
| 4671145 | Method and apparatus for the surface machining of substrate plates for magnetic memory plates | Volker Koch, Bernhard Boese | 1987-06-09 |
| 4347091 | Apparatus for the production of jackets for recording disks | Karl P. Hauck, Dieter Mayer, Herbert Wagner, Kurt Zwintzscher | 1982-08-31 |