Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5066059 | Drill string compensator with improved transloaders | Philip L. Ziegler III | 1991-11-19 |
| 4723805 | Transloader | H. John Bates | 1988-02-09 |
| 4365977 | Drilling mud degasser | — | 1982-12-28 |
| 4215643 | Quick release bollard | Robert K. Jefferies | 1980-08-05 |