Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11541625 | Wall assembly | Paul J. Fox | 2023-01-03 |
| 10801197 | Wall assembly having a spacer | Paul J. Fox, Chris Rosemond, Emily Van Court | 2020-10-13 |
| 9987764 | Tube insertion tool | — | 2018-06-05 |
| D741159 | Screw | — | 2015-10-20 |
| D722866 | Ball pin | — | 2015-02-24 |
| 8561730 | Foot valve assembly for a down hole drill | Jing James Yao, William H. Dell, II, Dale R. Wolfer, Timothy J. Plunkett | 2013-10-22 |
| 8215419 | Variable frequency control for down hole drill and method | Timothy J. Plunkett, Dale R. Wolfer | 2012-07-10 |
| 7073607 | Operating system for hydraulic rock drill | — | 2006-07-11 |
| 7044479 | Steel retainer for rock drill | Colin Campbell | 2006-05-16 |
| 7040417 | Drilling systems | James E. Coffman | 2006-05-09 |
| 6047778 | Percussion drill assembly | James E. Coffman, Paul W. Crites, Ewald H. Kurt | 2000-04-11 |
| 5957220 | Percussion drill assembly | James E. Coffman, Paul W. Crites, Ewald H. Kurt | 1999-09-28 |
| 5662180 | Percussion drill assembly | James E. Coffman, Paul W. Crites | 1997-09-02 |
| 5634524 | Reverse percussion device | — | 1997-06-03 |
| 5413186 | Reverse percussion device | — | 1995-05-09 |
| D355356 | An external surface of a splined nut | Robert R. Kimberlin | 1995-02-14 |
| D355355 | External surface of a splined nut | Robert R. Kimberlin | 1995-02-14 |
| 5350025 | Nonrotary piston for jackhammer and removable splined nut therefor | Robert R. Kimberlin, Sean O'Malley, Roland P. Holt | 1994-09-27 |
| 5305835 | Nonrotary piston for jackhammer and removable splined nut therefor | Robert R. Kimberlin | 1994-04-26 |
| 5031505 | Variable frequency control for percussion actuator | — | 1991-07-16 |
| 5022309 | Variable frequency control for percussion actuator | — | 1991-06-11 |