Showing 1–24 of 24 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Gerry H. Ehrhardt | Frye Copysystems | 3 |
| 1 | Francis E. Schlueter | John Deere | 3 |
| 3 | David Good | — | 2 |
| 3 | Ray T. Townsend | Townsend Engineering | 2 |
| 3 | Richard Nelson | Ncr | 2 |
| #6 | Carl R. Field | Duz-Mor | 1 |
| #6 | Dean L. Nims | — | 1 |
| #6 | Maurice S. Doane | — | 1 |
| #6 | Alan C. Parry | Unknown | 1 |
| #6 | Gary Maier | — | 1 |
| #6 | Willard D. Brittin | — | 1 |
| #6 | Stanley G. Roach | — | 1 |
| #6 | Kenneth Lee Dale | Unknown | 1 |
| #6 | Merlyn F. Bach | — | 1 |
| #6 | Merl S. Schillerstrom | John Deere | 1 |
| #6 | Wesley H. Boldt | — | 1 |
| #6 | Merle S. Schillerstrom | John Deere | 1 |
| #6 | Erwin W. Parr | Parr Manufacturing | 1 |
| #6 | Russell W. Carter | — | 1 |
| #6 | Michael S. Hatten | — | 1 |
| #6 | Robert W. Wilson | 3M | 1 |
| #6 | Wayne Jacobson | Cyclonaire | 1 |
| #6 | Timothy B. Brandt | Parr Manufacturing | 1 |
| #6 | Siebolt Hettinga | Central Quality Industries | 1 |
Part of Iowa