Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5300465 | Photochromic glasses which darken to a pink hue | Michel Prassas | 1994-04-05 |
| 5288669 | Glasses with very high index of refraction and low density | Pascale Laborde, Michel Prassas | 1994-02-22 |
| 5023209 | Fast fading, high refractive index photochromic glass | Michel Prassas | 1991-06-11 |