Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881599 | Mechanical system for diversion in the acidizing treatment of oil formations | Demostenis A. W. Barreto | 1989-11-21 |
| 4846277 | Continuous process of hydraulic fracturing with foam | Carlos Nagib Khalil | 1989-07-11 |