Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852991 | Dyeing of polyamide fibers with anionic dyes using a cationic assistant followed by an anionic assistant | Josef Frauenknecht | 1989-08-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852991 | Dyeing of polyamide fibers with anionic dyes using a cationic assistant followed by an anionic assistant | Josef Frauenknecht | 1989-08-01 |