Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8122954 | Downhole depth computation methods and related system | Robert A. Estes, Gary J. Cresswell, William Befeld | 2012-02-28 |
| 5979576 | Anti-whirl drill bit | Wayne R. Hansen, Paul E. Pastusek | 1999-11-09 |
| 5873422 | Anti-whirl drill bit | Wayne R. Hansen, Paul E. Pastusek | 1999-02-23 |
| 5025873 | Self-renewing multi-element cutting structure for rotary drag bit | — | 1991-06-25 |
| 4515227 | Nozzle placement in a diamond rotating bit including a pilot bit | — | 1985-05-07 |