Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10285540 | High volume frier/brazier system | — | 2019-05-14 |
| 6594199 | Hydrophone for use in a downhole tool | James R. Birchak, John W. Harrell | 2003-07-15 |
| 6438070 | Hydrophone for use in a downhole tool | James R. Birchak, John W. Harrell | 2002-08-20 |
| 6310426 | High resolution focused ultrasonic transducer, for LWD method of making and using same | James R. Birchak, James W. Stroud | 2001-10-30 |
| 4385449 | Method and apparatus for measuring tilt and relative bearing | — | 1983-05-31 |