Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872950 | Process for recovering energy and chemicals from spent liquor in pulp preparation | Bjorn S. Warnqvist | 1989-10-10 |
| 4857146 | Process for increasing the solids content of black liquor at its recovery in a sulfate pulping process | — | 1989-08-15 |