Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859286 | Isolation of 1,3-butadiene | Gerd Kaibel, Peter Keller, Werner Drewitz | 1989-08-22 |
WH
Werner Hefner
Overall (1989): #45,192 of 140,708Top 35%
1
Patents 1989