Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838668 | Zoom lens | Melvyn H. Kreitzer | 1989-06-13 |
| 4828372 | Wide-angle zoom lens | Melvyn H. Kreitzer | 1989-05-09 |
| 4815831 | Projection lens with color correction | — | 1989-03-28 |
| 4801196 | Wide angle projection lens | — | 1989-01-31 |