Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879463 | Method and apparatus for subsurface formation evaluation | Peter Wraight, Edouard Marienbach, Jean-Michel Hache, Erik Rhein-Knudsen | 1989-11-07 |
| 4814609 | Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole | Peter Wraight, Edouard Marienbach, Jean-Michel Hache, Erik Rhein-Knudsen | 1989-03-21 |