Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6467543 | System and process for secondary hydrocarbon recovery | Walter K. Feldman, Melvin Schweitzer | 2002-10-22 |
| 6152226 | System and process for secondary hydrocarbon recovery | Walter K. Feldman, Melvin Schweitzer | 2000-11-28 |