Showing 1–13 of 13 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Christopher E. Schafer | Schafer Systems | 18 |
| 2 | William Littler, IV | Unknown | 3 |
| 3 | Philip R. Littler | Schafer Systems | 2 |
| 3 | Michael E. Irlmeier | Schafer Systems | 2 |
| #5 | Betty L. Schafer | Schafer Systems | 1 |
| #5 | Jerry L. Oxley | — | 1 |
| #5 | Terry D. Fox | — | 1 |
| #5 | Mark P. Gettler | — | 1 |
| #5 | Steve Irlmeier, deceased | Schafer Systems | 1 |
| #5 | Tim Caltrider | Schafer Systems | 1 |
| #5 | William Littler IV | — | 1 |
| #5 | Craig Jensen | — | 1 |
| #5 | Timothy A. Schafer | — | 1 |
Part of Iowa