Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5695921 | Photographic elements with magenta dye forming couplers and stabilizers | Paul P. Spara, Rakesh K. Jain | 1997-12-09 |
| 5677118 | Photographic element containing a recrystallizable 5-pyrazolone photographic coupler | Paul P. Spara, Stanley W. Cowan, Ruthann M. McGarry | 1997-10-14 |
| 5627017 | Low melting point ionizable epoxy scavengers for residual magenta couplers | Krishnan Chari, Paul P. Spara | 1997-05-06 |
| 5605787 | 3-anilino pyrazolone magenta couplers and process | John L. Pawlak, David S. Bailey, William R. Schleigh, Charles E. Romano, Jr., Paul B. Merkel | 1997-02-25 |
| 5571926 | One-step process for preparation of N-(4-substituted pyrazolyl) amidines as intermediates in PT-coupler synthesis | — | 1996-11-05 |
| 5543276 | Color photographic element containing new epoxy scavengers for residual magenta coupler | Krishnan Chari, Wendell F. Smith, Jr., Paul P. Spara | 1996-08-06 |
| 5508147 | Color photographic element with improved resistance to thermal and photochemical yellowing and method thereof | Krishnan Chari, Wendell F. Smith, Jr. | 1996-04-16 |
| 5476756 | Color photographic element with improved resistance to thermal and photochemical yellowing | Krishnan Chari, Wendell F. Smith, Jr. | 1995-12-19 |
| 5447830 | 3-anilino pyrazolone magenta couplers and process | John L. Pawlak, David S. Bailey, William R. Schleigh, Charles E. Romano, Jr., Paul B. Merkel | 1995-09-05 |
| 5434040 | Photographic elements containing particular color couplers in combination with metal complex stabilizers | Rakesh K. Jain, Thomas H. Jozefiak, John L. Pawlak, Hugh M. Williamson | 1995-07-18 |
| 5426021 | Liquid or low melting bis-phenol stabilizers for yellow image dye stabilization in ektacolor paper | Rakesh K. Jain, Paul P. Spara, Thomas A. Rosiek | 1995-06-20 |
| 5399467 | Photographic couplers having a ballast containing a sulfone or sulfoxide group | Stanley W. Cowan | 1995-03-21 |
| 5378587 | Photographic material and process comprising a bicyclic pyrazolo coupler | Stanley W. Cowan | 1995-01-03 |
| 5359065 | Method of preparation of organosilyl substituted aromatic or heteroaromatic compounds | — | 1994-10-25 |
| 5318884 | Photographic silver halide material containing a coupler having a coupling-off group comprising a carbocyclic or heterocyclic ring having a silyl substituent directly attached thereto | — | 1994-06-07 |
| 5306604 | Photographic silver halide material containing a coupler having in a non-coupling position in a silyl substituent | — | 1994-04-26 |
| 5262292 | Photographic elements containing pyrazolone couplers and process | Thomas A. Rosiek, Vincent J. Flow, III, David S. Bailey, David J. Giacherio, John L. Pawlak +1 more | 1993-11-16 |
| 5250400 | Photographic material and process comprising a pyrazolotriazole coupler | Ping-Wah Tang, Stanley W. Cowan | 1993-10-05 |
| 5234805 | Photographic material and process comprising a pyrazolotriazole coupler | Ping-Wah Tang, Stanley W. Cowan | 1993-08-10 |
| 4853319 | Photographic silver halide element and process | Brian H. Johnston, Kenneth N. Kilminster, David C. Vogel, Paul R. Buckland | 1989-08-01 |
| 4827019 | Sterically hindered aromatic carboxylic esters | — | 1989-05-02 |
| 4740438 | Organic disulfides as image dye stabilizers | — | 1988-04-26 |
| 4728599 | Sterically hindered phenolic ester photographic coupler dispersion addenda and photographic elements employing same | — | 1988-03-01 |
| 4684606 | Sterically hindered photographic coupler solvents and photographic elements employing same | — | 1987-08-04 |
| 4540657 | Photographic coupler solvents and photographic elements employing same | — | 1985-09-10 |