Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834769 | Compositions for the dyeing of leather | Michel Dien | 1989-05-30 |
| 4820309 | 1:2-chromium complex dyes for tanned leather | — | 1989-04-11 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834769 | Compositions for the dyeing of leather | Michel Dien | 1989-05-30 |
| 4820309 | 1:2-chromium complex dyes for tanned leather | — | 1989-04-11 |