Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4273706 | Nondiffusible heterocyclylazonaphthol dye-releasing compounds | Derek D. Chapman | 1981-06-16 |
| 4228073 | Nondiffusible azo dye-releasing compounds | Derek D. Chapman | 1980-10-14 |
| 4207104 | Photographic products and processes employing novel nondiffusible heterocyclylazonaphthol dye-releasing compounds | Derek D. Chapman | 1980-06-10 |
| 4204870 | Photographic products and processes employing novel nondiffusible heterocyclyazonaphthol dye-releasing compounds | Derek D. Chapman | 1980-05-27 |
| 4183755 | Photographic products and processes employing metal complexable nondiffusible azo dye-releasing compounds | Derek D. Chapman | 1980-01-15 |