Patents per Year
Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 9151117 | Media pressure cavitation protection system for rock drills | — | 2015-10-06 | |
| 9086091 | Bearing assembly for rock drill | Larry W. McClure | 2015-07-21 | |
| 8590639 | Articulated pre-skimmer mount | — | 2013-11-26 | |
| 8584774 | Traveling and locking centralizer | — | 2013-11-19 | |
| 8443916 | Hose tensioner for a rock drill system | — | 2013-05-21 | |
| 8439566 | Wear pad adjustment assembly | — | 2013-05-14 | |
| 8424419 | Breakout wrench system | — | 2013-04-23 | |
| 8267202 | Feed chain automatic tensioner | — | 2012-09-18 | |
| 5762150 | Drill rod changer assembly | Eugene Cheng, Danny S. Bailey, Phillip A. Mayhew | 1998-06-09 | $25,193,000 |
| 5743345 | Drill bit for reverse drilling | Charles D. Hollar | 1998-04-28 | $47,837,000 |
| 5722496 | Removable guide member for guiding drill string components in a drill hole | James C. Patsell, James T. Laub | 1998-03-03 | $25,337,000 |
| D382887 | Back drilling threaded bit | Charles D. Hollar | 1997-08-26 | |
| 5269386 | Self positioning dust seal holder | George P. Schivley, Jr. | 1993-12-14 | $5,103,000 |