Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872995 | Method for calcium oxalate scale control | Fu Chen | 1989-10-10 |
| 4861429 | Process for inhibiting white pitch deposition in papermaking felts | Daniel Joseph Barnett | 1989-08-29 |