Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5309658 | Display element of transparent plastic with fluorescent colorant | Henri Cohen, Gertjan R. Willemsen | 1994-05-10 |
| D323789 | Reflector | Henri Cohen, Gertjan R. Willemsen | 1992-02-11 |