Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880313 | Method and nozzle for mixing mediums of different viscosity | Siegfried Meissl | 1989-11-14 |
| 4834837 | Method for delignification of cellulose with oxygen | Siegfried Meissl, Helmut Schweiger, Norbert Meindl, Karl Schwarzl, Anton Hruschka | 1989-05-30 |