Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7607494 | Earth penetrating apparatus and method employing radar imaging and rate sensing | Kevin L. Alft, Hans Kelpe | 2009-10-27 |
| 7143844 | Earth penetrating apparatus and method employing radar imaging and rate sensing | Kevin L. Alft, Hans Kelpe | 2006-12-05 |
| 6719069 | Underground boring machine employing navigation sensor and adjustable steering | Kevin L. Alft, Hans Kelpe | 2004-04-13 |
| 6484818 | Horizontal directional drilling machine and method employing configurable tracking system interface | Kevin L. Alft, Hans Kelpe | 2002-11-26 |
| 6315062 | Horizontal directional drilling machine employing inertial navigation control system and method | Kevin L. Alft | 2001-11-13 |
| 5621325 | Avoiding ghosting artifacts during surface location of subsurface transmitters | Frank S. Nickel, Michael F. Gard, Jian Jin | 1997-04-15 |