Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4537527 | Means for providing a vertical drain in soil | Matti Numminen | 1985-08-27 |
| 4455105 | Procedure and means for creating a vertical drain | — | 1984-06-19 |
| 4449848 | Means for providing a vertical drain in soil | — | 1984-05-22 |
| 4428699 | Procedure and means for providing a vertical drain in the bottom of a water body | — | 1984-01-31 |