Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4648478 | Device for generating sound pulses inside a well, by percussion | Pascal Dedole, Jean Laurent | 1987-03-10 |
| 4564083 | Device for generating acoustic shear waves in the earth | Pierre-Claude Layotte, Jacques Cholet, Roland Huin | 1986-01-14 |
| 4294318 | Device for measuring the stresses applied in use to the downhole assembly of a drill pipe | Robert Desbrandes | 1981-10-13 |