Issued Patents All Time
Showing 26–42 of 42 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5358836 | Photographic elements containing new magenta-dye-forming tris couplers | Philip T. S. Lau, Stanley W. Cowan | 1994-10-25 |
| 5358838 | Photographic elements containing new yellow-dye-forming tris couplers | Philip T. S. Lau, Stanley W. Cowan | 1994-10-25 |
| 5342943 | Preparation of 1H pyrazolo [3,2-c]-S-triazole compounds | Philip T. S. Lau | 1994-08-30 |
| 5340708 | Photographic elements containing new dye-forming tris couplers | Philip T. S. Lau, Stanley W. Cowan | 1994-08-23 |
| 5276158 | Method of preparing 5-amino-3-substituted-pyrazole | — | 1994-01-04 |
| 5262542 | Process for preparation of 1H-pyrazolo [1,5-b][1,2,4]triazole compounds by cyclization of N-(4-substituted-pyrazolyl)amidoxime | Terrence C. Mungal | 1993-11-16 |
| 5250400 | Photographic material and process comprising a pyrazolotriazole coupler | Sundaram Krishnamurthy, Stanley W. Cowan | 1993-10-05 |
| 5248786 | Process for preparation of 1H-pyrazolo [1,5-b][1,2,4]triazole couplers and intermediate compounds | Terrence C. Mungal | 1993-09-28 |
| 5237030 | Polymeric couplers prepared in the presence of a coupler solvent | Philip T. S. Lau, Stanley W. Cowan | 1993-08-17 |
| 5234805 | Photographic material and process comprising a pyrazolotriazole coupler | Sundaram Krishnamurthy, Stanley W. Cowan | 1993-08-10 |
| 5214194 | Coupler intermediates and their formation | Jeffrey R. Neff, Frank T. Melia, Donald J. Schuster | 1993-05-25 |
| 5122450 | Biochemical reagent | Ten Feizi | 1992-06-16 |
| 5100772 | Magenta dye forming coupler for photographic material | Tienteh Chen, Stanley W. Cowan, Edward Schofield | 1992-03-31 |
| 4992359 | Polymeric couplers | Philip T. S. Lau, Stanley W. Cowan | 1991-02-12 |
| 4914005 | Photographic element containing a cyan dye forming coupler | Philip T. S. Lau, Stanley W. Cowan | 1990-04-03 |
| 4804620 | Photographic material containing a novel polymeric dye-forming coupler | Philip T. S. Lau, Stanley W. Cowan, Harold I. Machonkin, Tien-Teh Chen | 1989-02-14 |
| 4612278 | Photographic materials and process comprising polymeric couplers with alkoxyalkylacrylate comonomers | Philip T. S. Lau | 1986-09-16 |