Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859286 | Isolation of 1,3-butadiene | Gerd Kaibel, Werner Hefner, Werner Drewitz | 1989-08-22 |
PK
Peter Keller
Overall (1989): #69,715 of 140,708Top 50%
1
Patents 1989