Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888092 | Primary paper sheet having a surface layer of pulp fines | L. Oscar Uhrig, Gene W. Wisecup | 1989-12-19 |
| 4869783 | High-yield chemical pulping | Clarence L. Oates | 1989-09-26 |