Issued Patents All Time
Showing 26–50 of 52 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5670302 | Photographic elements containing new magenta dye-forming couplers | Philip T. S. Lau, Louis J. Rossi | 1997-09-23 |
| 5667952 | Photographic material and process comprising a bicyclic pyrazolo coupler | Ping-Wah Tang | 1997-09-16 |
| 5654132 | Photographic materials and process comprising ureido naphtholic cyan couplers | Philip T. S. Lau | 1997-08-05 |
| 5614357 | Photographic element containing a particular cyan coupler bearing a sulfonyl containing ballast | Philip T. S. Lau | 1997-03-25 |
| 5609996 | Photographic emulsion layer containing pyrazoloazole coupler exhibiting improved dye light fade | Ping-Wah Tang, David J. Decker, Terrence C. Mungal | 1997-03-11 |
| 5576150 | Photographic dye-forming coupler, emulsion layer, element, and process | Ping-Wah Tang, David J. Decker, Daniel E. Corcoran | 1996-11-19 |
| 5457020 | Photographic material and process comprising a bicyclic pyrazolo coupler | Philip T. S. Lau, Ping-Wah Tang | 1995-10-10 |
| 5455147 | Methods of forming polymeric couplers | Tien-Teh Chen, Edward Schofield, Ping-Wah Tang | 1995-10-03 |
| 5427898 | Yellow couplers having an arloxy coupling-off group which contains an ortho polarizable functional group | Ping-Wah Tang, Philip T. S. Lau, Terrence C. Mungal | 1995-06-27 |
| 5399467 | Photographic couplers having a ballast containing a sulfone or sulfoxide group | Sundaram Krishnamurthy | 1995-03-21 |
| 5382502 | Hydroxyquinoline cyan couplers and their process of production | Philip T. S. Lau, Danny R. Thompson | 1995-01-17 |
| 5378587 | Photographic material and process comprising a bicyclic pyrazolo coupler | Sundaram Krishnamurthy | 1995-01-03 |
| 5360713 | Yellow dye-forming couplers and color photographic elements containing these couplers | Ping-Wah Tang, Philip T. S. Lau | 1994-11-01 |
| 5360710 | Color photographic materials containing polymeric couplers | Tien-Teh Chen, Edward Schofield, Ping-Wah Tang | 1994-11-01 |
| 5358837 | Photographic elements containing new magenta-dye-forming bis couplers | Ping-Wah Tang, Terrence C. Mungal, Philip T. S. Lau | 1994-10-25 |
| 5358829 | Photographic material and process comprising a bicyclic pyrazolo coupler | Ping-Wah Tang | 1994-10-25 |
| 5358835 | Photographic elements containing new yellow-dye-forming tris couplers | Ping-Wah Tang, Philip T. S. Lau | 1994-10-25 |
| 5358836 | Photographic elements containing new magenta-dye-forming tris couplers | Ping-Wah Tang, Philip T. S. Lau | 1994-10-25 |
| 5358838 | Photographic elements containing new yellow-dye-forming tris couplers | Ping-Wah Tang, Philip T. S. Lau | 1994-10-25 |
| 5340708 | Photographic elements containing new dye-forming tris couplers | Ping-Wah Tang, Philip T. S. Lau | 1994-08-23 |
| 5250400 | Photographic material and process comprising a pyrazolotriazole coupler | Sundaram Krishnamurthy, Ping-Wah Tang | 1993-10-05 |
| 5237030 | Polymeric couplers prepared in the presence of a coupler solvent | Ping-Wah Tang, Philip T. S. Lau | 1993-08-17 |
| 5234805 | Photographic material and process comprising a pyrazolotriazole coupler | Ping-Wah Tang, Sundaram Krishnamurthy | 1993-08-10 |
| 5100772 | Magenta dye forming coupler for photographic material | Tienteh Chen, Edward Schofield, Ping-Wah Tang | 1992-03-31 |
| 4992359 | Polymeric couplers | Ping-Wah Tang, Philip T. S. Lau | 1991-02-12 |