Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4914077 | Alkyl- or aryl-amino-pyridinyl- or pyrimidinyl-azo yellow dye-donor element for thermal dye transfer | Helmut Weber | 1990-04-03 |
| 4861700 | Photographic element containing yellow filter dyes having tricyanovinyl groups | Paul B. Merkel | 1989-08-29 |
| 4472169 | Mixtures of azo dyes from 2-amino-3-nitro-5-acyl thiophenes and certain aniline couplers | Michael H. Kearns, Robert Gourley | 1984-09-18 |
| 4366321 | Preparation of 2-halo-3-nitro-5-acyl thiophenes and intermediate compounds | David Mullen | 1982-12-28 |
| 4247458 | Process for preparing azo dyes | — | 1981-01-27 |