Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11105197 | Method and apparatus for pre-loading a piezoelectric transducer for downhole acoustic communication | Xiaojun Xiao, John-Peter van Zelm | 2021-08-31 |
| 10669842 | Method and apparatus for pre-loading a piezoelectric transducer for downhole acoustic communication | Xiaojun Xiao, John-Peter van Zelm | 2020-06-02 |
| 10465507 | Method and system for controlling voltage applied across a piezoelectric stack of a downhole acoustic transmitter | — | 2019-11-05 |
| 9797241 | Acoustic transmitter for transmitting a signal through a downhole medium | — | 2017-10-24 |
| 8393412 | System and method for accurate wellbore placement | Paul L. Camwell, David D. Whalen, James M. Neff | 2013-03-12 |
| 6822434 | Monolithic transformer compensated circuit | James W. Haslett, Bogdan Georgescu, Holly Pekau | 2004-11-23 |
| 6734712 | Logarithmic amplifier | Christopher D. Holdenried, James W. Haslett, Robert Davies | 2004-05-11 |
| 6590451 | RF amplifier with feedback based linearization | — | 2003-07-08 |
| 6061024 | Duplexing antenna for portable radio transceiver | Andrew E. McGirr, Paul L. Camwell | 2000-05-09 |
| 5867061 | Transformer coupled stacked power amplifier | Gordon Glen Rabjohn, Mark S. Suthers, Robert Leroux | 1999-02-02 |
| 5640417 | QAM detector which compensates for received symbol distortion induced by a cellular base station | Darrell Barabash, Alan D. McGrath | 1997-06-17 |
| 5231407 | Duplexing antenna for portable radio transceiver | Andrew E. McGirr, Paul M. Camwell | 1993-07-27 |