Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4311388 | Visibility measuring device | Michel C. Roiret | 1982-01-19 |
| 4225245 | Apparatus for measuring the optical transmissive power of the atmosphere | Michel C. Roiret, Michel Dupitier | 1980-09-30 |