Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6690617 | Application of sonic signals to detect buried, underground utilities | — | 2004-02-10 |
| 6679120 | System and method for guided boring obstacle detection | Ching-Chen Wu, Douglas G. Niessen | 2004-01-20 |