Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8600679 | System and method to locate, monitor and quantify friction between a drillstring and a wellbore | Roland May, John D. Macpherson, Thomas Dahl | 2013-12-03 |
| 8248266 | Bidirectional telemetry apparatus and methods for wellbore operations | John D. Macpherson, Frank W. Shepard, Volker Krueger | 2012-08-21 |
| 7694558 | Downhole washout detection system and method | John D. Macpherson | 2010-04-13 |
| 7477161 | Bidirectional telemetry apparatus and methods for wellbore operations | John D. Macpherson, Frank W. Shepard, Volker Krueger | 2009-01-13 |