Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8270248 | Method for initializing receiver channels in a cement bond logging tool | John Marshall | 2012-09-18 |
| 7911876 | Method for initializing receiver channels in a cement bond logging tool | John Marshall | 2011-03-22 |
| 7902469 | Perforation gun pressure-actuated electrical switches and methods of use | — | 2011-03-08 |
| 7802619 | Firing trigger apparatus and method for downhole tools | John Marshall, David S. Wesson | 2010-09-28 |
| 7414918 | Method for normalizing signals in a cement bond logging tool | John Marshall | 2008-08-19 |
| 7411864 | Method for processing signals in a cement bong logging tool | John Marshall, David M. O'Connor | 2008-08-12 |
| 7372777 | Sonic instrumentation apparatus and method for cement bond logging | Marvin Beckman | 2008-05-13 |