Issued Patents 2016
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9435196 | Downhole electromagnetic and mud pulse telemetry apparatus | David A. Switzer, Jili Liu, Aaron W. Logan | 2016-09-06 |
| 9291049 | Downhole electromagnetic and mud pulse telemetry apparatus | David A. Switzer, Jili Liu, Aaron W. Logan | 2016-03-22 |