Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4598158 | Novel image dye-providing materials and photographic products and processes | Stephen Robert Herchen | 1986-07-01 |
| 4420627 | Hydrazine dyes | — | 1983-12-13 |
| 4386150 | Novel image dye-providing materials and photographic products and processes | Stephen Robert Herchen | 1983-05-31 |