Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4450044 | Method for bleaching oxygen delignified cellulose-containing pulp with ozone and peroxide | Bjorn H. Fritzvold | 1984-05-22 |
| 4279694 | Method for treating refined mechanical pulp and thermo mechanical pulp with ozone | Bjorn H. Fritzvold | 1981-07-21 |