Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4298681 | N,N Disubstituted p-phenylenediamine phosphates to form a color developer working solution, a color developer concentrate containing such a phosphate and a method of using said working solution for color development of color film | David K. Bulloch | 1981-11-03 |