Showing 1–5 of 5 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | William B. Hilfiker | Hilfiker Pipe Co. | 1 |
| 1 | Robbin R. Lorensen | Yakima Products | 1 |
| 1 | Harold K. Hilfiker | Hilfiker Pipe Co. | 1 |
| 1 | David A. Daniel | Nuon | 1 |
| 1 | William K. Hilfiker | Hilfiker Pipe Co. | 1 |
Part of California