Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5340857 | Photochromic naphthopyrans | — | 1994-08-23 |
| 5330686 | Temperature stable and sunlight protected photochromic articles | Robert A. Smith | 1994-07-19 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5340857 | Photochromic naphthopyrans | — | 1994-08-23 |
| 5330686 | Temperature stable and sunlight protected photochromic articles | Robert A. Smith | 1994-07-19 |