Issued Patents All Time
Showing 26–50 of 76 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7500651 | Portable winch | Paul Hau | 2009-03-10 |
| 7255516 | Method and apparatus for replacement of underground pipe | Mark D. Randa, Robert F. Crane | 2007-08-14 |
| 7140806 | Rod pulling and pushing machine for pipe bursting | Robert F. Crane | 2006-11-28 |
| 7128499 | Method for extracting underground pipe | — | 2006-10-31 |
| 7086808 | Method and apparatus for on-grade boring | Robert F. Crane, Mark D. Randa | 2006-08-08 |
| 7055621 | Method and apparatus for replacement of underground pipe | Mark D. Randa | 2006-06-06 |
| 7048257 | Winch with telescoping mast | Paul Hau | 2006-05-23 |
| 6913091 | Method and apparatus for replacement of underground pipe | Mark D. Randa, Robert F. Crane | 2005-07-05 |
| 6860514 | Drill string joint | Mark D. Randa, Robert F. Crane | 2005-03-01 |
| 6792820 | Method and accessories for pipe replacement | Payce D. Reynolds | 2004-09-21 |
| 6789635 | Drill bit for directional drilling in cobble formations | Robert F. Crane, Douglas Caraway | 2004-09-14 |
| 6761507 | Method and apparatus for replacement of underground pipe | Mark D. Randa | 2004-07-13 |
| 6755593 | Pipe replacement method and rotary impact mechanism for pipe bursting | Robert F. Crane, Paul Hau | 2004-06-29 |
| 6655874 | Method and apparatus for slitting flexible pipe in an underground bore | Robert F. Crane | 2003-12-02 |
| 6588515 | Drill bit for directional drilling | Robert F. Crane | 2003-07-08 |
| 6581680 | Apparatus for mounting an electronic device for use in directional drilling | — | 2003-06-24 |
| 6568488 | Roller pipe burster | Robert F. Crane, Paul Hau | 2003-05-27 |
| 6533052 | Drill bit for impact-assisted directional boring | Robert F. Crane, Mark D. Randa, Randy R. Runquist, Richard K. Smith | 2003-03-18 |
| 6516899 | Method and apparatus for directional boring under mixed conditions | Robert F. Crane, Randy R. Runquist, Mark Van Houwelingen | 2003-02-11 |
| 6470979 | Sonde housing structure | Robert F. Crane | 2002-10-29 |
| 6450269 | Method and bit for directional horizontal boring | Robert F. Crane | 2002-09-17 |
| 6439319 | Method and apparatus for directional boring under mixed conditions | Robert F. Crane, Randy R. Runquist, Mark Van Houwelingen | 2002-08-27 |
| 6422782 | Apparatus for mounting an electronic device for use in directional drilling | — | 2002-07-23 |
| 6390207 | Method and apparatus for directional boring under mixed conditions | Robert F. Crane, Randy R. Runquist, Mark Van Houwelingen | 2002-05-21 |
| 6390087 | Drill bit for directional drilling | Robert F. Crane | 2002-05-21 |