Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6204598 | Electric incandescent lamp with sintered glass plate | Ursula Bruggemann, Wilfried L. Kohlmann, Antonius J. M. Van Hees | 2001-03-20 |
| 6140769 | Electric incandescent lamp with sintered body glass plate | Ursula Bruggemann, Wilfried L. Kohlmann, Antonius J. M. Van Hees | 2000-10-31 |