Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6082707 | Valve seat and method | Michael Brian Grayson, David Ward | 2000-07-04 |
| 6059262 | Valve operator and method | Michael Brian Grayson, David Ward | 2000-05-09 |
| 5603384 | Universal perforating gun firing head | Robert K. Bethel, Michael Brian Grayson | 1997-02-18 |