Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5937953 | Soil sampling tool with unique vent-and-seal features and related method | Nils K. Melberg, Lloyd E. Jacobs, David E. Turriff | 1999-08-17 |
| 5706904 | Soil sampling tool with volume-indicating feature | David E. Turriff, Lloyd E. Jacobs, Nils K. Melberg | 1998-01-13 |
| 5522271 | Tool and method for soil sampling | David E. Turriff, Lloyd E. Jacobs, Nils K. Melberg | 1996-06-04 |