Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6241888 | Method of controlling the phosphorus concentration in biological wastewater purification plants | — | 2001-06-05 |
| 4541587 | Hub for magnetic tape cassettes, especially compact cassettes, and magnetic tape cassette possessing one or more such hubs | Werner Stumpfi, Gunter Bettinger, Horst Fitterer, Norbert Kreimes, 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, Horst Fitterer, Norbert Kreimes, Dietmar Pfefferkorn +2 more | 1985-05-07 |