Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6554421 | Non-correcting lens blank, and method for making same | Etienne Billard | 2003-04-29 |
| 6540352 | Noncorrective prism compensating lens and eyeglass provided with said lens | Etienne Billard | 2003-04-01 |