Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D987693 | Crop debris clearing disc | Derek Litchfield | 2023-05-30 |
| 10462959 | Seed furrow closing wheel | Patrick Whalen, Derek Litchfield | 2019-11-05 |
| 9932178 | Adjustment device for grain handling conveyor | Gary W. Lantz, James D. Lascelles | 2018-04-03 |
| D801396 | Seed furrow closing wheel | Patrick Whalen, Derek Litchfield | 2017-10-31 |
| 8826836 | Row treating unit for agriculture implement | Loyd C. Van Buskirk, Dylan C. Van Buskirk | 2014-09-09 |
| 8752642 | Implement height adjuster | Patrick Whalen, Derek Litchfield | 2014-06-17 |
| D663326 | Cast closing wheel | Jim Lascelles, Derek Litchfield | 2012-07-10 |