Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859286 | Isolation of 1,3-butadiene | Gerd Kaibel, Werner Hefner, Peter Keller | 1989-08-22 |
WD
Werner Drewitz
Overall (1989): #38,645 of 140,708Top 30%
1
Patents 1989