Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4851575 | Process for the preparation of 2-nitro-4-sulfamyldiphenylamine dyestuffs | Werner Brodt | 1989-07-25 |
| 4824962 | Process for the preparation of naphthostyril | Otto Arndt | 1989-04-25 |
| 4808752 | Process for the preparation of 2-aminophenyl thioethers | — | 1989-02-28 |