Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Donald Lee Gramlich, Jr. | Grote Industries | 9 |
| 2 | Richard Turley | HP | 7 |
| 3 | Stanley D. Robbins | Grote Industries | 5 |
| #4 | Gayle L. Wheeler | Cummins Engine | 1 |
| #4 | Veronica E. Phillips | — | 1 |
| #4 | Donald N. Case | Cummins Engine | 1 |
Part of Indiana