Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6557629 | Wellhead isolation tool | Henry Wong, George E. Guthrie, Christopher P. Egan | 2003-05-06 |
| 4848777 | Pressure energized/pressure intensified casing seal | David Zollo, David Cain, Phillip F. Huang, Brenda K. Montemayor, Ray V. MYERS +3 more | 1989-07-18 |