Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797131 | Use of certain quaternary ammonium compounds in dyeing leather with basic dyestuffs | — | 1989-01-10 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4797131 | Use of certain quaternary ammonium compounds in dyeing leather with basic dyestuffs | — | 1989-01-10 |