Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4876329 | Polyimide polymers and copolymers using 3,5-diaminobenzotrifluoride | Weilong L. Chiang, Douglas E. Fjare | 1989-10-24 |
| 4876385 | Batch or semicontinuous pseudocumene oxidation and catalyst recovery and recycle | Donald E. Thomka | 1989-10-24 |
| 4822527 | Process for preparation of anthraquinones and fluorenones | David E. James | 1989-04-18 |
| 4816601 | Process for the manufacture of trimellitic acid | James D. Lowry, Jr., Walter Partenheimer | 1989-03-28 |
| 4804501 | Process for preparation of anthraquinones and fluorenones | David E. James | 1989-02-14 |