Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9790789 | Apparatus and method for obtaining formation fluid samples | David A. Hejl | 2017-10-17 |
| 9714556 | Shear seal check valve for use in wellbore fluid | Harry W. Bullock | 2017-07-25 |
| 8074511 | Use of flexible member for borehole diameter measurement | Cornelis Huiszoon, Homero C. Castillo, Roger R. Steinsiek, Gabriel Villasmil | 2011-12-13 |
| 8074712 | Stop collar friction clamping device | Roger R. Steinsiek, James C. Hunziker | 2011-12-13 |