Issued Patents All Time
Showing 1–25 of 27 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10227832 | Tapered thread configuration with improved durability | Michael D. Langenfeld | 2019-03-12 |
| 10124509 | Cutting tooth system | Keith A. Hoelting | 2018-11-13 |
| 9732560 | Drilling tool and apparatus | Christopher R. Fontana, Keith A. Hoelting | 2017-08-15 |
| 9624730 | Hard facing configuration for a drilling tool | Keith A. Hoelting, Chris Fontana | 2017-04-18 |
| 9611698 | Hole opener bearing arrangement | John P. Maher | 2017-04-04 |
| 9605491 | Tapered thread configuration with improved durability | Michael D. Langenfeld | 2017-03-28 |
| 9016366 | Tapered thread configuration with improved durability | Michael D. Langenfeld | 2015-04-28 |
| 8991490 | Tapered thread configuration with improved durability | Michael D. Langenfeld | 2015-03-31 |
| 8939237 | Underground drilling apparatus | Keith A. Hoelting | 2015-01-27 |
| D719988 | Rear connection inter-face for a reducing element of a material reducing machine | Clint Weinberg, Keith Roozeboom | 2014-12-23 |
| RE44427 | Apparatus for directional boring under mixed conditions | Mark Van Houwelingen, James Richard Rankin, ReneMarcel Albert | 2013-08-13 |
| 8235142 | Underground boring machine and method for controlling underground boring | Robin W. Carlson | 2012-08-07 |
| 8220564 | Devices and methods for dynamic boring procedure reconfiguration | Hans Kelpe | 2012-07-17 |
| 7721821 | Underground boring machine and method for controlling underground boring | Robin W. Carlson | 2010-05-25 |
| 7694753 | Dual rod drill pipe with improved flow path method and apparatus | Robin W. Carlson, Tod Michael, Shawn Moyer | 2010-04-13 |
| 6668946 | Backreamer | James Richard Rankin, Richard K. Smith, Jr., Peter C. Rozendaal, Scott Rempe | 2003-12-30 |
| 6659202 | Steerable fluid hammer | Mark Van Houwelingen | 2003-12-09 |
| 6588516 | Method and apparatus for directional boring under mixed conditions | Mark Van Houwelingen, James Richard Rankin, Rene Albert | 2003-07-08 |
| 6533052 | Drill bit for impact-assisted directional boring | Steven W. Wentworth, Robert F. Crane, Mark D. Randa, Richard K. Smith | 2003-03-18 |
| 6516899 | Method and apparatus for directional boring under mixed conditions | Steven W. Wentworth, Robert F. Crane, Mark Van Houwelingen | 2003-02-11 |
| 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 |