Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6140819 | Continuous-depth-indicating underground pipe and cable locator | David L. Peterman | 2000-10-31 |
| 5686828 | Method for locating the joints and fracture points of underground jointed metallic pipes and cast-iron-gas-main-pipeline joint locator system | David L. Peterman | 1997-11-11 |
| 5001430 | Apparatus for locating concealed electrical conductors | David L. Peterman | 1991-03-19 |
| 4520317 | Apparatus including a pair of automatic gain controlled amplifiers for determining the lateral direction to a concealed conductive object | — | 1985-05-28 |
| 4387340 | Apparatus for determining the distance to a concealed conductive object which is radiating an alternating current signal | — | 1983-06-07 |