Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842688 | Method of removing macromolecular organic dissolved and colloidal material from wood processing industry effluents | Johan Gullichsen | 1989-06-27 |
| 4812207 | Method of removing lignin from bleach plant effluents | Johan Gullichsen | 1989-03-14 |