Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883530 | Use of ammonium syngenite as a slow-acting nitrogen fertilizer | Vilmos Czikkely, Johann Jung | 1989-11-28 |
WM
Walter Von Maessenhausen
Overall (1989): #136,691 of 140,708Top 100%
1
Patents 1989