Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6298918 | System for lifting petroleum by pneumatic pumping | Francisco Alberto Cerqueira De Oliveira | 2001-10-09 |
| 5580391 | Process for the thermo-chemical cleaning of storage tanks | Carlos Nagib Khalil, Oswaldo d. Pereira, Jr. | 1996-12-03 |
| 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 |