Showing 1–16 of 16 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Michael D. Van Mill | Unverferth Manufacturing Co. | 71 |
| 2 | Ronald J. Schlimgen | Unverferth Manufacturing Co. | 45 |
| 3 | Robert Mehmen | Waterloo Industries | 26 |
| #4 | Carl T. Vuk | John Deere | 23 |
| #5 | Steve Downing | H.D. Hudson Manufacturing | 8 |
| #6 | Douglas C. Madsen | — | 3 |
| #6 | Wayne J. Brocka | — | 3 |
| #6 | Christopher A. Lursen | Cnh Industrial America | 3 |
| #9 | Laverne Woock | Garrett | 2 |
| #10 | David Nusbaum | John Deere | 1 |
| #10 | Carl H. Arns | — | 1 |
| #10 | Robert J. Mehman | Waterloo Industries | 1 |
| #10 | Dale L. Schwab | — | 1 |
| #10 | Wade Goeke | — | 1 |
| #10 | Shoshanna R. Coon | University Of Northern Iowa Research Foundation | 1 |
| #10 | Stanley J. Neuhaus | — | 1 |
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