Top Inventors at Marshalltown All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | John T. Hughes | 12 |
| 2 | John Reynolds | 12 |
| 3 | Charles Henry Cowie | 7 |
| #4 | Mark Fulmer | 7 |
| #5 | Israel Holby | 5 |
| #6 | Georgia Pyatt | 4 |
| #7 | Jim Bowie | 4 |
| #8 | Noah Garwood | 4 |
| #9 | Troy Thurber | 4 |
| #10 | Jarod Elsberry | 3 |
| #11 | Ashley Swanson | 3 |
| #12 | Michael Shane Grigg | 2 |
| #13 | Christopher D. Hageman | 1 |
| #14 | Dalen Eugene Gunn | 1 |
| #15 | David Mathieu | 1 |
| #16 | David B. Strickland | 1 |
| #17 | Jack D. Murders | 1 |
| #18 | James Sener | 1 |
| #19 | Mitchell M. Leonard, II | 1 |
| #20 | Nathaniel P. Brand | 1 |
| #21 | Hayden Beckwith | 1 |
| #22 | Erica R. Asfahl | 1 |
| #23 | Andrew Harding | 1 |