Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4420222 | Mirror having a variable focal length | Georges G. Bret | 1983-12-13 |
| 4407567 | Objective having a variable focal length | Georges G. Bret | 1983-10-04 |
| 4298247 | Thick optical element having a variable curvature | Jean-Pierre Treton | 1981-11-03 |
| 4289379 | Optical system having a variable focal length | — | 1981-09-15 |