Showing 1–24 of 24 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Christopher N. Fredd | Schlumberger Technology | 30 |
| 2 | Philip C. Roller | Truck-Lite Co. | 20 |
| 3 | Daniel Mark Graham | Weber Knapp | 15 |
| #4 | Benjamin L. Ludwig | Whirley Industries | 7 |
| #5 | David Seeley | Pandrol Limited | 6 |
| #5 | John M. Poignard | E.P. Henry | 6 |
| #5 | Ben Ludwig | Whirley Industries | 6 |
| #8 | Kevin W. Opferbeck | Bush Industries | 3 |
| #8 | Carl F. Musolff | Cummins Engine | 3 |
| #10 | Gary M. Olson | — | 2 |
| #10 | Michael Kosinski | Cummins | 2 |
| #12 | Dennis L Furlow | — | 1 |
| #12 | Rachel M. Ludwig | Whirley Industries | 1 |
| #12 | Phillip C. Roller | Truck-Lite Co. | 1 |
| #12 | Melburn W. Dennis | — | 1 |
| #12 | Ryne R. Johnson | — | 1 |
| #12 | Alton B. Johnson | Trw Limited | 1 |
| #12 | John D. Beckstrom | — | 1 |
| #12 | Gilbert T. Mesler | — | 1 |
| #12 | Arthur V. Palmer | — | 1 |
| #12 | Shane R. Applebee | — | 1 |
| #12 | Paul J. Kahanic, Jr. | Truck-Lite Co. | 1 |
| #12 | Bruce R. Sweeney | — | 1 |
| #12 | Judy Swanson | Dr. Johannes Heidenhain Gmbh | 1 |
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