Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842638 | Herbicidal tetrahydro(thio)pyran-2,4-dione derivatives | Michael Keil, Dieter Kolassa, Ulrich Schirmer, Bruno Wuerzer, Norbert Meyer +2 more | 1989-06-27 |
| 4820331 | Cyclohexenone derivatives useful for regulating plant growth | Michael Keil, Ulrich Schirmer, Dieter Kolassa, Wilhelm Rademacher, Johann Jung | 1989-04-11 |