Showing 1–17 of 17 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Andrew F. Johnke | Ortloff Engineers | 24 |
| 2 | John D. Preheim | Raven Industries | 23 |
| 3 | Sean Coffman | Full-Swing Golf | 13 |
| #4 | John W. Finger | Sioux | 11 |
| #5 | Brad Hyronimus | Sioux | 6 |
| #5 | John F. Finger | Sioux Steam Cleaner | 6 |
| #7 | James M. Verros | Cmi Limited | 4 |
| #8 | Gary Spilde | Sioux Steam Cleaner | 3 |
| #9 | Mark Kayne | Sioux | 2 |
| #9 | Glen Lawrenson | Sioux Steam Cleaner | 2 |
| #9 | Timothy Eldred Kilmer | — | 2 |
| #9 | Zachary T. Pramann | Kooima Company | 2 |
| #9 | Marc Bogue | — | 2 |
| #9 | Bradley A Hyronimus | Sioux | 2 |
| #15 | Albert D. Ottmar | — | 1 |
| #15 | Darrell D. Vik | — | 1 |
| #15 | Richard W. Wickstrom | Sioux Steel | 1 |
Part of South Dakota