Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4985873 | Method and apparatus for determining compressional first arrival times from waveform threshold crossings provided by apparatus disposed in a sonic well tool | Kevin Eyl, David Lineman, Edward Alan Pierce, Joseph M. Steiner, Jr. | 1991-01-15 |
| 4703460 | Method and apparatus for acoustic dipole direct shear wave well logging | Shu-Kong Chang, Ann H. Everhart | 1987-10-27 |
| 4698792 | Method and apparatus for acoustic dipole shear wave well logging | Shu-Kong Chang | 1987-10-06 |