Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874835 | Polyetherimides and precursors therefor from oxydiphtalic anhydride diester and a mixture of diamines | — | 1989-10-17 |
| 4855391 | High temperature stable polyetherimides from oxydiphthalic dianhydride and a mixture of m- and p-phenylene diamines and diaminodiphenyl ether | James Anthony Cella, Gary Shank | 1989-08-08 |
| 4808731 | Method for making oxydiphthalic anhydride | Pamela A. Matsch | 1989-02-28 |