Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6007111 | Dual metal seal for wellhead housing | — | 1999-12-28 |
| 5896925 | Tool protection guide | Gerald Brian Swagerty, David Cain, John Robert Herold, Randy Elum, Bashir M. Koleilat +1 more | 1999-04-27 |
| 5732731 | Secondary seal bypass valve for gate valves | — | 1998-03-31 |
| 5730218 | Tool protection guide with energy absorbing bumper | Gerald Brian Swagerty, David Cain, John Robert Herold, Randy Elum, Bashir M. Koleilat +1 more | 1998-03-24 |
| 5511286 | Handle with modular hub | Michael R. Williams, Richard D. Van Orsdale, Orlando A. Mejia | 1996-04-30 |
| 5404615 | Handle | Michael R. Williams, Richard D. Van Orsdale, Orlando A. Mejia | 1995-04-11 |
| 5221063 | Selective double backseat for valve stems | Michael R. Williams | 1993-06-22 |
| 4848777 | Pressure energized/pressure intensified casing seal | David Zollo, Roy W. Benefield, David Cain, Phillip F. Huang, Brenda K. Montemayor +3 more | 1989-07-18 |
| 4711262 | Uni-directional/bi-directional gate valve | Claud C. Barrington | 1987-12-08 |