Top Inventors at Preco Industries All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Charles C. Raney | 9 |
| 2 | Hongli Du | 4 |
| 3 | John T. Pierson | 4 |
| #4 | Ivan B. Helmrich | 2 |
| #5 | James T. Gramling | 2 |
| #6 | Robert J. Ilukowicz | 2 |
| #7 | Christopher Walker | 1 |
| #8 | Dana Poulain | 1 |
| #9 | Joseph E. Raney | 1 |
| #10 | Patrick J. Cheek | 1 |
| #11 | Raymond E. Dick | 1 |
| #12 | Ralph Gifford | 1 |
| #13 | Robert G. Weidhaas, Sr. | 1 |
| #14 | Robert Weidhaas, Jr. | 1 |
| #15 | Ted A. Teuscher | 1 |
| #16 | William Hodges | 1 |
| #17 | John T. Skahan | 1 |
| #18 | Matthew S. Amburg | 1 |