Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4465104 | Pressure energized pipeline plug | Robert H. Wittman, David E. Adkins | 1984-08-14 |
| 4422477 | Pressure energized pipeline plug | Robert H. Wittman, David E. Adkins | 1983-12-27 |
| 4332277 | Pipeline pigging plug | David E. Adkins, Arthur H. T. Chin, Robert H. Wittman | 1982-06-01 |