Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4951267 | Method and apparatus for multipole acoustic logging | Shu-Kong Chang, Benoit Froelich | 1990-08-21 |
| 4850450 | Logging tool housing with acoustic delay | David C. Hoyle, Shu-Kong Chang | 1989-07-25 |