Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4849492 | Polyhydantoins containing sulphone groups | Friedrich Jonas, Rudolf Merten, Werner Schmidtberg | 1989-07-18 |
| 4841073 | Radical anion salts of derivatives of 1,4,5,8-naphthalenetetracarboxylic acid and their use | Tillmann Hassel, Jurgen Hocker, Hans Muller, Hans G. Fitzky | 1989-06-20 |