Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8776701 | Row crop fertilizer applying apparatus | Lee F. Nikkel | 2014-07-15 |
| 8256526 | Apparatus and a system for providing guidance control for pull type tongued implements | Marlin W. Unruh | 2012-09-04 |
| 8109070 | Dual windrow crop inverting and combining apparatus and method | Lawrence E. Kuhlmann | 2012-02-07 |
| 7623952 | GPS controlled guidance system for farm tractor/implement combination | Marlin W. Unruh | 2009-11-24 |
| 7490678 | GPS controlled guidance system for farm tractor/implement combination | Marlin W. Unruh, Lee F. Nikkel, Lawrence E. Kuhlmann, David R. Long | 2009-02-17 |
| 6354429 | Agricultural crop material windrow inverting method and apparatus | Lawrence E. Kuhlmann | 2002-03-12 |
| 6279666 | Row crop debris clearing apparatus | Lee F. Nikkel | 2001-08-28 |
| 5752453 | Apparatus for use in applying fertilizer | Lee F. Nikkel | 1998-05-19 |
| 5732780 | Implement for making angled water retention depressions and mounds | Lee F. Nikkel, David R. Long | 1998-03-31 |
| 5582255 | Guidance system having adjustable width capability | Lee F. Nikkel | 1996-12-10 |
| 5524525 | Rotary servo valve and guidance system apparatus for controlling the same | Lee F. Nikkel, Marlin W. Unruh | 1996-06-11 |
| 5240079 | Guidance control system for farm tractor/implement combination having improved turnaround capability | — | 1993-08-31 |
| 5170849 | Guidance control system for farm tractor/implement combination | Lee F. Nikkel, Marlin W. Unruh | 1992-12-15 |
| 5156219 | Positioning apparatus for drawn implement | Lee F. Nikkel | 1992-10-20 |
| RE34080 | Row following guidance device for a tractor-drawn row crop implement | — | 1992-09-29 |
| 5025866 | Row following drawn implement with internal steering arm | Lee F. Nikkel | 1991-06-25 |
| 4640365 | Row following guidance device for a tractor-drawn row crop implement | — | 1987-02-03 |