Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4816534 | Preparation of vinylpyrrolidone polymers | Walter Denzinger, Axel Sanner | 1989-03-28 |
| 4795802 | Removal of vinylpyrrolidone from vinylpyrrolidone polymers | Axel Sanner, Dieter Urban | 1989-01-03 |