Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5609996 | Photographic emulsion layer containing pyrazoloazole coupler exhibiting improved dye light fade | Ping-Wah Tang, Stanley W. Cowan, David J. Decker | 1997-03-11 |
| 5510492 | Process of preparing pyrazolo 1,5-b! 1,2,4! triazoles | Ping-Wah Tang | 1996-04-23 |
| 5474993 | Lactam inhibitors of cholesterol esterase | Byron Rubin, Kenneth C. Mattes | 1995-12-12 |
| 5427898 | Yellow couplers having an arloxy coupling-off group which contains an ortho polarizable functional group | Ping-Wah Tang, Philip T. S. Lau, Stanley W. Cowan | 1995-06-27 |
| 5424179 | Photographic element with a cyclic azole coupler having a saccharin substituent | Ping-Wah Tang | 1995-06-13 |
| 5358837 | Photographic elements containing new magenta-dye-forming bis couplers | Ping-Wah Tang, Philip T. S. Lau, Stanley W. Cowan | 1994-10-25 |
| 5262542 | Process for preparation of 1H-pyrazolo [1,5-b][1,2,4]triazole compounds by cyclization of N-(4-substituted-pyrazolyl)amidoxime | Ping-Wah Tang | 1993-11-16 |
| 5248786 | Process for preparation of 1H-pyrazolo [1,5-b][1,2,4]triazole couplers and intermediate compounds | Ping-Wah Tang | 1993-09-28 |