Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7314012 | Method and apparatus for splitting, mulching, and leveling soil beds for planting | — | 2008-01-01 |
| 5297898 | Apparatus for extracting drip irrigation tubing | — | 1994-03-29 |
| 4637755 | Apparatus for burying conduit | Scott Tollefson, Charles Schultz | 1987-01-20 |
| 4447173 | Apparatus for burying drip irrigation tubing | Charles Schultz, Mark S. Tollefson | 1984-05-08 |