Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889593 | Method of determining rapidly the concentration of the total sulphur dioxide and the lignosulphonate present in sulphite pulping process liquors | Panu Tikka | 1989-12-26 |
| 4842689 | Method for controlling sulphite pulping and hydrolytic processes by means of rapid furfural analyzer | Panu O. Jikka | 1989-06-27 |