Showing 1–7 of 7 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Marlin L. Johnson | Kann Manufacturing | 18 |
| 2 | Virgil L. Collins | Kann Manufacturing | 9 |
| 3 | Boris Trifunovic | John Deere | 6 |
| 3 | Dirk C. Kann | Kann Manufacturing | 6 |
| #5 | Chester F. Couser | — | 2 |
| #6 | Rick B. Nugent | — | 1 |
| #6 | Audree R. Niehaus | — | 1 |
Part of Iowa