Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4480104 | Hydroquinone derivatives and their use in photographic materials | Stephen Postle | 1984-10-30 |
| 4443537 | Hydroquinone derivatives and their use in photographic materials | Stephen Postle, Brian R. D. Whitear | 1984-04-17 |
| 4426444 | Hydroquinone derivatives and their use in photographic materials | Stephen Postle | 1984-01-17 |
| 4417072 | Hydroquinone derivatives and their use in photographic materials | Stephen Postle, Brian R. D. Whitear | 1983-11-22 |
| 4410702 | Hydroquinone derivatives of pyridinecarboxylic acids | Stephen Postle | 1983-10-18 |
| 4353974 | Process for the production of photographic images and photographic materials used in this process | Terence C. Webb, William E. Long | 1982-10-12 |