Issued Patents 2002
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491115 | Directional drilling machine and method of directional drilling | Mark Van Houwelingen, Brian John Bischel, Mark Robert Stelter, Gregg Austin | 2002-12-10 |
| 6454025 | Apparatus for directional boring under mixed conditions | Mark Van Houwelingen, James Richard Rankin, ReneMarcel Albert | 2002-09-24 |
| 6439319 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Robert F. Crane, Mark Van Houwelingen | 2002-08-27 |
| 6390207 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Robert F. Crane, Mark Van Houwelingen | 2002-05-21 |
| 6357537 | Directional drilling machine and method of directional drilling | Mark Van Houwelingen | 2002-03-19 |