Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855458 | Manufacture of phthalic anhydride by gas phase oxidation of a mixture of o-xylol and naphthalene | Manfred zur Hausen, Wilfried Krix | 1989-08-08 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855458 | Manufacture of phthalic anhydride by gas phase oxidation of a mixture of o-xylol and naphthalene | Manfred zur Hausen, Wilfried Krix | 1989-08-08 |