Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6458970 | Method for producing acid phthalic anhydride and an appropriate shell catalyst containing titanium-vanadium-cesium | Gerhard Hefele, Otto Kratzer, Bernhard Ulrich | 2002-10-01 |