Showing 1–9 of 9 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Joseph C. Holt | Talbert Manufacturing | 4 |
| 1 | Jeffrey Butts | Vesuvius Group, S.A. | 4 |
| 3 | Hugh V. Morton | H-C Industries | 3 |
| #4 | Joseph Groover | — | 1 |
| #4 | Dallas McMurtrie | — | 1 |
| #4 | Lorita Dillon | Unknown | 1 |
| #4 | Donna La Foe | — | 1 |
| #4 | Paul W. La Foe | — | 1 |
| #4 | Gretchen E. Groover | — | 1 |
Part of Indiana