Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4833269 | Method for purifying terephthalic acid recycle streams | — | 1989-05-23 |
| 4808751 | Method for reactivating a group VIII noble metal catalyst for use in the purification of crude terephthalic acid | Ricky L. Wittman | 1989-02-28 |