Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5534401 | Retouchable reversal silver halide photographic element with a pyrazoloazole magenta dye-forming coupler | J. Ramon Vargas, John W. Harder, Phillip D. Knight, Paul A. Burns | 1996-07-09 |
| 5296337 | Process for retouching photographic images containing a dye having a cleavable ballast | J. Ramon Vargas, John W. Harder, Phillip D. Knight, Paul A. Burns | 1994-03-22 |
| 4524122 | Substituted 4-nitrophenylazo-1-naphthol cyan dyes having improved light stability | Paul B. Merkel, Harold C. Warren, III | 1985-06-18 |