Top Inventors at Keystone Retaining Wall Systems All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Robert A. MacDonald | 132 |
| 2 | Thomas S. Riccobene | 65 |
| 3 | Robert John Lundell | 32 |
| #4 | David M. LaCroix | 24 |
| #5 | Paul J. Forsberg | 22 |
| #6 | William B. Dawson | 18 |
| #7 | Robert J. Race | 9 |
| #8 | Stephen Tyson Homeyer | 9 |
| #9 | Craig D. Moritz | 5 |
| #10 | Dominic T. Riccobene | 4 |
| #11 | David Lee | 3 |
| #12 | J. Michael Stevenson | 2 |
| #13 | Joseph M. Friederichs | 2 |
| #14 | Richard Kenneth Magnuson | 2 |
| #15 | Brian Philip Nemez | 1 |
| #16 | David W. Knight | 1 |
| #17 | Donald L. Reuschel | 1 |
| #18 | John Campau | 1 |
| #19 | John Daniel Campau | 1 |
| #20 | Kyle Bakner | 1 |
| #21 | William H. Karau | 1 |
| #22 | Antal Suto | 1 |