Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8413677 | System for accelerating relief valve opening | William Paul Coffman | 2013-04-09 |
| 4634154 | Lightweight integral pup joint with split female sub | Vas D. Arora, William A. Gill | 1987-01-06 |