Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8727040 | Drill string valve and method | Michael Friedrichs | 2014-05-20 |
| 8539975 | Drill string valve and method | Michael Friedrichs | 2013-09-24 |
| 5411106 | Method and apparatus for acquiring and identifying multiple sidewall core samples | Jacques Maissa, Marcelo F. Civarolo | 1995-05-02 |
| 5101104 | Carrier apparatus for radioactive well logging instrument | — | 1992-03-31 |