Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5361848 | Agricultural cultivator | John C. David, Russell G. Evans, Robert R. Cutsor, Elmer S. Zach | 1994-11-08 |
| 5031704 | Guidance control apparatus for agricultural implement | John C. David | 1991-07-16 |
| 4930581 | Guidance control apparatus for agricultural implement | John C. David | 1990-06-05 |
| 4585074 | Ridge forming apparatus | John C. David | 1986-04-29 |
| 4580506 | Liquid fertilizer attachment | John C. David | 1986-04-08 |