Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33349 | Controlling sulfide scavenger content of drilling fluid | Stephen D. Matza, William E. Ellington | 1990-09-25 |
| 4840910 | Controlling sulfide scavenger content of drilling fluid | Stephen D. Matza, William E. Ellington | 1989-06-20 |
| 4805708 | Controlling sulfide scavenger content of oil-based drilling fluid | Stephen D. Matza, William E. Ellington | 1989-02-21 |
| 4658914 | Controlling sulfide scavenger content of drilling fluid | Stephen D. Matza, William E. Ellington | 1987-04-21 |