Showing 1–7 of 7 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Harold Gibson | Coal Industry (Patents) Limited | 4 |
| 2 | Roy N. Laney | — | 3 |
| 2 | Dan Barnard | Iowa State University | 3 |
| #4 | Edgar L. Hamm, Jr. | — | 1 |
| #4 | Newby O. Brantly | — | 1 |
| #4 | Lee M. Matthew | Unknown | 1 |
| #4 | Robert C. Spain | — | 1 |
Part of Oklahoma