Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5691601 | Metal-halide discharge lamp for photooptical purposes | Anna-Maria Frey, Jürgen Maier, Manfred Pilsak, Ralf Seedorf, Clemens Barthelmes | 1997-11-25 |
| 5689154 | Metal halide gas discharge lamp for projection purposes | Clemens Barthelmes, Ralf Seedorf | 1997-11-18 |