Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4870194 | Process for the preparation and recovery of oxdiphthalic anhydrides | John R. Molinaro, Joseph A. Pawlak | 1989-09-26 |
| 4868316 | Process for the preparation of diether diphthalic anhydrides | — | 1989-09-19 |
| 4837404 | Process for the preparation of oxy-diphthalic anhydrides | — | 1989-06-06 |
| 4827000 | Process for the preparation of phenoxy phthalic anhydrides | — | 1989-05-02 |