Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5375658 | Shut-in tools and method | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-12-27 |
| 5335731 | Formation testing apparatus and method | Paul D. Ringgenberg | 1994-08-09 |
| 5332035 | Shut-in tools | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-07-26 |
| 5279363 | Shut-in tools | Roger L. Schultz, Craig L. Zitterich, William L. Bohan | 1994-01-18 |