Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888325 | Controlling plant pests with compositions containing alkyl glycoside | Hans Bouten, Manfred Biermann | 1989-12-19 |
| 4820517 | Process for obtaining a pepper extract with insecticidal activity | Hans Pfeiffer, Manfred Biermann, Gerd Goebel, Annemarie Mueller | 1989-04-11 |