Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8479614 | Internally retained jaw roller pin | Steven Hargreaves, Jeremy J. Vaughan, Kelvin Isaacson | 2013-07-09 |
| 8453541 | Reduced weight power tong for turning pipe | Dan Dagenais, Steven Hargreaves | 2013-06-04 |
| 8267448 | Cam arm actuated backup tong | Dan Dagenais, Steven Hargreaves | 2012-09-18 |
| 8234957 | Internally retained jaw roller pin | Steven Hargreaves, Jeremy J. Vaughan, Kelvin Isaacson | 2012-08-07 |
| 6942458 | Variable pitch fan | Jonathan E. McCallum, Terry Dean Nelson | 2005-09-13 |
| 6644922 | Variable pitch fan | Jonathan E. McCallum, Brian Bruchal | 2003-11-11 |
| 6439850 | Variable pitch fan | Jonathan E. McCallum, Brian Bruchal | 2002-08-27 |
| 6113351 | Variable pitch fan | Jonathan E. McCallum, Brian Bruchal | 2000-09-05 |