Top Inventors at Underground Systems All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Paul A. Alex | 6 |
| 2 | Duncan Breese | 5 |
| 3 | John Engelhardt | 5 |
| #4 | Larry Fish | 5 |
| #5 | Charles J. Wills | 2 |
| #6 | Chunchuan Xu | 2 |
| #7 | James A. Bright | 2 |
| #8 | Robert F. Smith | 2 |
| #9 | Charles Lipsky | 1 |
| #10 | David C. Bliven | 1 |
| #11 | David W. Purnhagen | 1 |
| #12 | John Mattis | 1 |
| #13 | Steven S. Sunshine | 1 |