Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4931219 | Photochromic compound and articles containing the same | Patricia L. Kwiatkowski | 1990-06-05 |
| 4909963 | Photochromic article | Chin-Wen Chen | 1990-03-20 |
| 4831142 | Spiro indoline-pyranobenzoxazinones | — | 1989-05-16 |
| 4816584 | Photochromic spiro(indoline)benzoxazines | Chin-Wen Chen | 1989-03-28 |
| 4785097 | Method for synthesizing spiro-oxazines | — | 1988-11-15 |
| 4720547 | Photochromic compound and articles containing the same | Rodney J. Hurditch | 1988-01-19 |
| 4637698 | Photochromic compound and articles containing the same | Rodney J. Hurditch | 1987-01-20 |