Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5686235 | Photographic elements containing cyan dye-forming coupler having a sulfone ballast group | Philip T. S. Lau, Stanley W. Cowan | 1997-11-11 |
| 5674666 | Photographic elements containing new cyan dye-forming coupler providing improved color reproduction | Philip T. S. Lau, Stanley W. Cowan | 1997-10-07 |
| 5670302 | Photographic elements containing new magenta dye-forming couplers | Philip T. S. Lau, Stanley W. Cowan | 1997-09-23 |