Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6744204 | Gas discharge lamp | Wilhelm A. Groen, Petra Huppertz, Knuth Albertsen | 2004-06-01 |
| 6713946 | Liquid crystal picture screen with improved backlighting | Wilhelm A. Groen, Knuth Albertsen | 2004-03-30 |