Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5416219 | Preparation of monoclinic metazachlor | Michael Keil, Bjoern Girgensohn, August Wigger, Hans Ziegler, Walter Gueckel | 1995-05-16 |
| 5300652 | Preparation of monoclinic metazachlor | Michael Keil, Bjoern Girgensohn, August Wigger, Hans Ziegler, Walter Gueckel | 1994-04-05 |
| 5250503 | Monoclinic metazachlor and composition | Michael Keil, Bjoern Girgensohn, August Wigger, Hans Ziegler, Walter Gueckel | 1993-10-05 |
| 4396415 | Herbicide | Walter Gueckel | 1983-08-02 |