Top Inventors at North American Pipe All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Joshua E. Clapper | 12 |
| 2 | Roy L. Dean | 11 |
| 3 | Dmitry Yashin | 10 |
| #4 | John R. Magargal | 2 |
| #5 | John Swartzentruber | 2 |
| #6 | Leopold Parth | 2 |
| #7 | Mark Brunni | 2 |
| #8 | Michael A. Dotsey | 2 |
| #9 | Aaron Blinn | 2 |
| #10 | Gary A. Leigh | 1 |
| #11 | Larry G Keller | 1 |
| #12 | S. Clayton Snear | 1 |
| #13 | Alexander Gorshenin | 1 |