Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4864034 | Spiro(bis)indane bis-oxyphthalic acids and functional derivatives thereof | James Anthony Cella | 1989-09-05 |
| 4847432 | Method for the purification of ion exchange resins used in the production of bisphenol A | — | 1989-07-11 |