Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4852665 | Method for monitoring the operations of the rotary drilling of a well | Richard Deshais | 1989-08-01 |
| 4840061 | Method of detecting a fluid influx which could lead to a blow-out during the drilling of a borehole | — | 1989-06-20 |