Showing 1–11 of 11 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Jim C. Rothman | Donaldson Company | 29 |
| 2 | Daniel L. Harp | Hach | 3 |
| 3 | Michael P. Lesar | — | 2 |
| 3 | Richard A. Rajkovich | — | 2 |
| 3 | Clarence Ramme | — | 2 |
| 3 | Peter Van Patten | — | 2 |
| #7 | George Reck | — | 1 |
| #7 | Jeffery Willard Lakela | — | 1 |
| #7 | Kenneth Heem | Unknown | 1 |
| #7 | Floyd L. Synstelien | — | 1 |
| #7 | Kristin Raver | — | 1 |
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