Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6166798 | TN cell having improved display of grey shades | Herbert Plach | 2000-12-26 |
| 5696570 | TN cell having improved display of grey shades | Herbert Plach | 1997-12-09 |
| 4830469 | Liquid crystalline color display cell having a phosphorescent substrate and U.V.-absorbing dichroic dye | Hendrik Adrianus Van Sprang | 1989-05-16 |