Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883539 | Coated silicate particles | Harri Mattila | 1989-11-28 |
| 4882011 | Device for generating negative pressure inside a mantle of a revolving roll | Vesa Vuorinen, Seppo Rantanen | 1989-11-21 |