Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6351080 | Circuitry for dimming a fluorescent lamp | Berthold Birk, Gunter Hahlganss, Walter Kares | 2002-02-26 |
| 6067081 | Method for producing tactile markings on an input surface and system for carrying out of the method | Gunter Hahlganss, Guido Meier-Arendt | 2000-05-23 |
| 4980633 | Method and apparatus for measuring a vehicle's own speed by the Doppler radar principle | — | 1990-12-25 |