Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6790585 | Method for developing a high contrast photographic material containing a polyhydrazide nucleating agent | Jacques Roussilhe, John D. Goddard, Llewellyn J. Leyshon | 2004-09-14 |
| 6087084 | Auxiliary developing agents, photographic materials incorporating them and the use thereof | Peter J. Twist | 2000-07-11 |
| 6083673 | Organic/inorganic developer composition | Jacques Roussilhe | 2000-07-04 |
| 6033833 | Fogging solution for a reversal process | Peter J. Twist, David T. Southby | 2000-03-07 |
| 5972584 | Auxiliary development agents photographic materials incorporating them and the use thereof | Peter J. Twist | 1999-10-26 |
| 5962203 | Fogging solution for a reversal process | Peter J. Twist, David T. Southby | 1999-10-05 |
| 5958664 | Coupler capable of releasing a development accelerator | Peter J. Twist, David T. Southby | 1999-09-28 |
| 5942379 | 3-pyrazolidone compounds and photographic developer solutions containing same | Jacques Roussilhe | 1999-08-24 |
| 5932399 | Auxiliary developing agents, photographic materials incorporating them and the use thereof | Peter J. Twist | 1999-08-03 |
| 5837434 | Photographic developers containing a developing agent of the ascorbic acid type and an accelerator | Jacques Roussilhe | 1998-11-17 |
| 5780212 | Photographic developing composition | Jacques Roussilhe | 1998-07-14 |
| 5554492 | Photographic silver halide color material | — | 1996-09-10 |
| 5411842 | Method of making a photographic developer solution | Michael Ridgway, Nigel E. Milner, Paul C. Ward | 1995-05-02 |
| 5385816 | Photographic silver halide color materials with sulfonylhydrazine color developer | Paul L. Stanley | 1995-01-31 |
| 4978605 | Benzoylacetanilide photographic yellow dye image-forming couplers and photographic elements containing them | — | 1990-12-18 |
| 4758501 | Photographic acetanilide couplers and photographic elements containing them | Paul R. Buckland | 1988-07-19 |