Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8902712 | Method for enhancing low frequency output of impulsive type seismic energy sources and its application to a seismic energy source for use while drilling | Robert P. Radtke, Robert H. Stokes | 2014-12-02 |
| 8619503 | Sparker type wellbore seismic energy source having controllable depth independent frequency | Robert P. Radtke, Robert H. Stokes | 2013-12-31 |
| 6427791 | Drill bit assembly for releasably retaining a drill bit cutter | David W. Raymond | 2002-08-06 |
| 5343968 | Downhole material injector for lost circulation control | — | 1994-09-06 |