Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5639701 | Permanent tint photochromic glasses | David J. Kerko | 1997-06-17 |
| 5607493 | Method of making non-photochromic optical filter glasses | David J. Kerko | 1997-03-04 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5639701 | Permanent tint photochromic glasses | David J. Kerko | 1997-06-17 |
| 5607493 | Method of making non-photochromic optical filter glasses | David J. Kerko | 1997-03-04 |