Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5673751 | System for controlling the flow of fluid in an oil well | Philip Head, Paul Gullett | 1997-10-07 |
| 5404945 | Device for controlling the flow of fluid in an oil well | Philip Head, Paul Gullett | 1995-04-11 |