Issued Patents 2003
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |