Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4656548 | Tape cassette containing echo-erasing means | Dietmar Pfefferkorn, Gerhard Nerschbach, Eberhard Koester, Bozidar Pavelka | 1987-04-07 |
| 4541587 | Hub for magnetic tape cassettes, especially compact cassettes, and magnetic tape cassette possessing one or more such hubs | Werner Stumpfi, Gunter Bettinger, Friedrich Engel, Horst Fitterer, Dietmar Pfefferkorn +2 more | 1985-09-17 |
| 4515331 | Hub for magnetic tape cassettes, especially compact cassettes, and magnetic tape cassette possessing one or more such hubs | Werner Stumpfi, Gunter Bettinger, Friedrich Engel, Horst Fitterer, Dietmar Pfefferkorn +2 more | 1985-05-07 |
| 4453683 | Magnetic tape cassette arrangements | Karl-Juergen Reimer, Dietmar Pfefferkorn, Eberhard Koester, Wilhelmus Andriessen, Herbert Wagner +1 more | 1984-06-12 |
| 4396169 | Magnetic tape cassette | Gunter Bettinger | 1983-08-02 |