Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869588 | Non-progressive multifocal ophthamic lenses | Michael Walach | 1989-09-26 |
| 4867553 | Finished composite eyeglass lens | — | 1989-09-19 |
| 4846913 | Method for making bifocal lens | J. Edward deRojas | 1989-07-11 |